Discussion of Question with ID = 028 under Simple-Interest

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The difference between simple interests on an amount @11% for 18 years and at 6% for 16 years is Rs. 816. What is the amount?


Rs. 800.


Rs. 900.


Rs. 700.


Rs. 1000.

Ans: a

The shortcut formula is P = ${\text"diff" × 100}/{r_1 × t_1 - r_2 × t_2}$. Putting r1 = 11, t1 = 18, r2 = 6, t2 = 16, diff = 816, we get P = Rs. 800.

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