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Need help for IGCSE Economics very urgent.

S

scarychibi

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What is the formula for Price elasticity of demand ,Price elasticity of supply,Cross elasticity of demand and Income elasticity of demand? I think i wrote down the wrong formula in my notes. AND also for ( Multiple choice)Paper Jun 2010 0455/11/M/J/10, Question 8 why is the answer B(0.5) instead of C(2). Hence, again for the same paper, im also confused on Question 17 please explain.
Thanks in advance :)
 
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