A=P×(1+R∕100)n Calculation: Let P=x Since interest is compounded every 10 months, number of compounding periods in 2.5 years =(30 months ∕10 months )=3 Effective rate for 10 months =12×(10∕12)=10% So, A=x×(1+10∕100)3 54571=x×(110∕100)3 54571=x×(1331∕1000) x=54571×(1000∕1331) x=41000