Question

find the compound interest on rupees 4000 accurued in 3 years, when the rate of interest is 8% for the first year and 10% per year for II and III years

Answer 1

Principal : 4000 /-
Time 3 years.
Rate of interest : 1st year 8% and 2nd 3rd year 10%
Amount : 4000×(1+8/100)(1+10/100)(1+10/100)
= 5227.20 Rs
The compound interest is 1227.20/-
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Answer 2

Principal=Rs.4000
Time=3years
Rate of Interest for Ist year=8%
Rate of Interest for 2nd nd 3rd year=10% 

Amount for 3 years is.=4000(1+8/100)(1+10/100)(1+10/100)
                                                    .=4000(108/100)(110/100)(110/100)
                                                   . =4000*1.08*1.1*1.1=Rs.5227.2
Compound Interest=5227.2-4000=Rs.1227.2