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Formula for multiplier - 1/MRT+MRS+MPM or Change In Income/Change in Injectionhttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Economics (9708)/9708_s10_qp_31.pdf
Question number 20
How B? Workings pls
MRT = 0.15 (15/100)
MPM = 0.30
MPS = 0.05
Therefore 1/(0.15+0.3+0.05) = 2
Substitute this answer to the other formular.
Change in income is given (10000)
so.
10000/x = 2
x=5000=Change in injection/spending
InititalSpending = 15000
Change 5000
Total = 20000