Question

3. The simple interest on a sum of money will be Rs. 250 after 6 yrs. In the
next 6 yrs. Principal is doubled. What will be the total interest at the end of
12 yrs.
(A) Rs. 250
(B) Rs. 500
(C) Rs. 750
(D) Rs. 1000​

Answer 1

Step-by-step explanation:

Let the original rate be R percent per year, the principal amount be P, time T

Given is SI = 600 = P * R * 10 / 100

Hence P*R = 6000

SI for first five years will be 300 at the end of first 5 years.

When P is trebled for next five years, the SI for those five years will be = 3P * R * 5 / 100 = [ 15* P * R ] /100 = [ 15 * 6000 ] / 100 = 900

Hence the total interest will be 300 + 900 = 1200

Answer 2

Answer:

6 yrs -250

6 yrs - 500 (double)

total 12 yrs = 750