Question

At what rate of simple interest a sum of money amounts rs. 928 after 4 years and Rs 992 after 6 years

Answer 1

rate is 4%

992-928=64

64 is SI for two years

so SI for 1 year and each consecutive years is 64/2=32 as SI will be same over the period for each year

Now 928 is amount after 4 years

now sum at the beginning or sum before 4 years

= 928-32-32-32-32=800

Now initially sum is 800 and SI for 1st year is 32..

so rate will be (32/800)*100=4