Simple and Compound Interest Questions

Multiple choice
  1. $10$
  2. $20$
  3. $15$
  4. $25$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The difference between CI and SI for 2 years is given by the formula: Difference = P * (r/100)^2. Plugging in the values: 200 = 20000 * (r/100)^2. This simplifies to 200/20000 = (r/100)^2, so 1/100 = (r/100)^2. Taking the square root, 1/10 = r/100, so r = 10.

Multiple choice
  1. Sneha, Rs.$198.40$
  2. Sneha, Rs.$146.50$
  3. Shikha, $146.50$
  4. Shikha, $198.40$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Simple interest is Rs. 1,920. Compound interest is Rs. 6,400 x (1.1^3 - 1) = Rs. 2,118.40, so Shikha earns Rs. 198.40 more.

Multiple choice
  1. Rs.12,000

  2. Rs.13,250

  3. Rs.6,792

  4. Rs,.10,000

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let the original deposit be P. The increase in annual interest is 0.06(P+2000) - 0.05P = 220. Solving gives 0.01P = 100, so P = Rs. 10,000.