Question

a sum of money at simple interest amounts to rupees 800 in 2 years and 2 years and rupeess 1200 in 6 years .The sum is​

Answer 1

Interest on 800 for the fourth year= 840–800

For 800 interest for 1 year is 40. Hence rate of interest, (100 X 40)/800 = 5%

Step-by-step explanation:

Let P be principal at start.

P X (105/100)^3 = 800.

P X 1.157625 = 800

P = 691.07