Question

The simple interest on a sum of money will be Rs. 6000 after 10 years. If the principal is tripled after 5 years, what will be the total interest at the end of the tenth year?

• A. Rs. 6000
• B. Rs. 9000
• C. Rs. 12000
• D. Rs. 15000

Answer 1

The correct option is C Rs. 12000

Let sum $=$ x, S.I. $=$ Rs. 6000, Time $=$ 10 years.

Rate $=\left(\frac{100\times 6000}{x\times 10}\right)=\left(\frac{60000}{x}\right)$%

S.I. for first 5 years

$=Rs.\left(\frac{x\times 5\times 60000}{x\times 100}\right)=Rs.3000$

S.I. for last 5 years $=Rs.(3x\times 5\times \frac{60000}{x\times 100})$

$=Rs.9000$

$\therefore$ Total interest $=Rs.12000$.