Selected MCQ

Current Question
The simple interest and true discount on a certain sum for a given time at a given rate are Rs. 85 and Rs. 80, respectively. Find the sum.
  • A. Rs. 1800
  • B. Rs. 1450
  • C. Rs. 1360
  • D. Rs. 6800
Correct Answer: C
Explanation:
Using the relation between SI and TD, the principal is Rs. 1360.
Related Question 1
The simple interest on Rs. 49500 for 3 years is Rs. 17820. What is the compound interest on the same sum and time at the same rate?
  • A. Rs. 20043.94
  • B. Rs. 18654.81
  • C. Rs. 20264.46
  • D. Rs. 19612.41
Correct Answer: A
Explanation:
First, find the rate from SI, then apply the CI formula to get Rs. 20043.94.
Related Question 2
There is a 60% increase in a sum in 6 years at simple interest. What will be the compound interest on Rs. 12000 for 3 years at the same rate?
  • A. Rs. 2160
  • B. Rs. 3120
  • C. Rs. 3972
  • D. Rs. 6240
Correct Answer: C
Explanation:
Rate = 10%, CI = 12000[(1.1)³ − 1] = 3972.
Related Question 3
A reservoir is 80 m × 60 m × 6.5 m. Time to fill at given rate is ____.
  • A. 26 hours
  • B. 42 hours
  • C. 52 hours
  • D. 65 hours
Correct Answer: C
Explanation:
Volume ÷ rate.
Related Question 4
True discount on Rs. 2562 due in 4 months is Rs. 122. Find rate.
  • A. 12%
  • B. 13%
  • C. 15%
  • D. 14%
Correct Answer: C
Explanation:
Solve using the TD formula.
Related Question 5
True discount on Rs. 1760 at 12% is Rs. 160. Find time.
  • A. 6 months
  • B. 8 months
  • C. 9 months
  • D. 10 months
Correct Answer: D
Explanation:
Use TD relation.