Question

a certain sum of money amounts to Rs600 in two years and Rs700 in 4years at certain rate of interest find the rate of interest​

Answer 1

Answer:

Let us consider as I as simple interest in one year and N is number of years, so the formula is Aₙ=[p+n×I]

Step-by-step explanation:

so⇒A₂=600 and A₄=700

A₄=p+4I⇒1 equation

A₂=p+2I⇒2 equation

so when we subtract 2-1 we get 100=2I

so I =100/2=50

so let us substitute I=50 in 2nd equation

we get A₂=p+2I

           600=p+2×50

 ⇒   600=p+100

p=600-100=500

rate of interest is 50/500×100=10%