Question

a sum becomes 4800 after 2 yrs and 6400 after 4 yrs. find the sum

Answer 1

Sum after 2 years = Rs 4800

Sum after 4 years = Rs 6400

Find the interest earned in the two years:

Interest = 6400 - 4800 = Rs 1600

Find the principal sum:

Principal sum = Sum for 2 years - Interest for 2 years

Principal sum = 4800 - 1600 = Rs 3200

Answer: The original sum is Rs 3200

Answer 2

$\underline{\bold{Solution:-}}$

In 2 years sum become = 4800 rupees

In 4 years sum become = 6400 rupees


Simple Interest in 2 years = 6400-4800

=1600 rupees


Amount after 2 years = 4800 rupees

Principal = Amount after 2 years - Interest in 2 years

= 4800-1600

=3200 rupees

The sum of 3200 rupees will amount to 4800 rupees in 2 years and 6400 rupees in 4 years.