Mathematics: Post your doubts here!

[memo right here]

btw same situation here

 

[Lost_Life]

Assalam-o-alaikum wr wb...
actually i 'think' the mistake you are doing is taking $99 as Interest....actually the interest is $99-$90=$9...now solve and you will get 5%

I=PRT/100
$9=($90*R*2)/100
$9*100=$180R
$900/180=R
therefore...R=5%

how i mean why dont u stick with the formulae?

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

how i mean why dont u stick with the formulae?

i am sticking with the formula...i am sure your formula and method is correct but the mistake you are doing is....Interest is NOT $99...it $99-$90! i.e $9...now get it?

 

[always-smile :)]

i think you should revise first and when you are confident that you know everything...do "atleast" 2 or 3 "recent" papers...on YOUR own...first do it and then check it with the mark scheme so that you know where do you make mistakes and Inshallah you will avoid them in the exam

ok that's helpful but i'm never sure that i knw everything even if i really do
i'll take ur advice thanx alooot

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

ok that's helpful but i'm never sure that i knw everything even if i really do
i'll take ur advice thanx alooot

haha..well i think that's the problem with everyone what you can do is...just revise everything

 

[Lost_Life]

i am sticking with the formula...i am sure your formula and method is correct but the mistake you are doing is....Interest is NOT $99...it $99-$90! i.e $9...now get it?

OMG IM GUNNA DIE :'( NO I DON'T i still dont understand why you would subtract when its already stated that it should be 99

 

[always-smile :)]

haha..well i think that's the problem with everyone what you can do is...just revise everything

hahaha that's fine so i'm not ill or something ........ok

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

OMG IM GUNNA DIE :'( NO I DON'T i still dont understand why you would subtract when its already stated that it should be 99

nope its okie...and listen! its written! "the amount of money he has at the end of 2 years is 99" which means that the TOTAL money is $99...nowhere it is mentioned that $99 is the Interest!

 

[always-smile :)]

bec. the formula of simple interest only gives the extra money that u will have after the stated time SO when he tell you that he ha 99 after the stated time so the extra is 9 bec he had 90 before saving the money ..... did you get it??

 

[Lost_Life]

ohhh..... so if like, they gave you two currencies one mentioned that its the total of the other i subtract??

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

ohhh..... so if like, they gave you two currencies one mentioned that its the total of the other i subtract??

only if it's not written that it is the interest OR you have another way to know! like...if the principal that is the amount of money is LESS than the other amount which you "doubt" is interest! cz obviously no bank will you give you more interest than the money you kept in the bank

 

[Lost_Life]

bec. the formula of simple interest only gives the extra money that u will have after the stated time SO when he tell you that he ha 99 after the stated time so the extra is 9 bec he had 90 before saving the money ..... did you get it??

waittt.... major break down, could you state the formula in words... maybe ill understand more

 

[Lost_Life]

only if it's not written that it is the interest OR you have another way to know! like...if the principal that is the amount of money is LESS than the other amount which you "doubt" is interest! cz obviously no bank will you give you more interest than the money you kept in the bank

ohh .. O.O New windows opened... THANK YOU!!!! thanks ........but..let me get it once more, so if i had a principal that is less than the interest.. i subtract.. :O

 

[always-smile :)]

waittt.... major break down, could you state the formula in words... maybe ill understand more

------------------
interest add=principle amount x ratio x time / 100
so when get the interest add it on the principle amount and u will get the total u have ..... got it ??

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

ohh .. O.O New windows opened... THANK YOU!!!! thanks ........but..let me get it once more, so if i had a principal that is less than the interest.. i subtract.. :O

yeah...

though it is not ACTUALLY the interest...but people get confused so yeah

 

[Lost_Life]

I feel like im going to fail BIG TIME

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

I feel like im going to fail BIG TIME

nah...don't think like that...Inshallah you won't! juss be confident and think that you can do it!
My tip: Read the question properly, understand it and then try to solve

 

[always-smile :)]

yeah...

though it is not ACTUALLY the interest...but people get confused so yeah

how can u have principle less than the interest :O .... it is the opposite we always have principle more than the interest or you mean after adding ??

 

[shefali]

thnx alot <3

THIS IS YOU ANSWER TO WHAT YOU ASKED

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

how can u have principle less than the interest :O .... it is the opposite we always have principle more than the interest or you mean after adding ??

that's what i am saying we can't have!
actually...she isn't able to understand it that's why i said when she "THINKS" that the particular value is interest, she should check whether is the principal less than it or not!
i mean in this case...she thought $99 is the interest..but $99 is greater than the principal ($90) isn't it? it means that it is NOT the interest and she needs to subtract...get it?