Question

if the ratio of amount and principle after 5 years will be 21 :20 find rate of interest

Answer 1

If After 5 years, Amount:Principal=21:20

then after  5 years SI:Principal=1:20

rate for 5 years= ( SI:Principal)*100=(1/20)*100=5%

rate for 1 year=5/5=1%

rate is 1% per annum