Question:Mr.Roopchand finds that an increase in the rate of interest from 478% to 518% per annum increases his yearly income by Rs.25.His investment is :
ARs.10,000
BRs.12,000
CRs,15,000
DRs.20,000
/61
+ Answer
A
+ ExplanationLet the investment be Rs.x.Then,
x+418×1100-x×398×1100=25⇔2x=20000⇔x=10000