RRB NTPC-Mathematics Quiz : For Compound Interest , Simple Interest

Q1. The difference between simple and compound interest (compounded annually) on a sum of money for 2 years at 10% per annum is Rs. 65. The sum is
(a) Rs. 65650
(b) Rs. 65065
(c) Rs. 6565
(d) Rs. 6500

Q2. The compound interest on a certain sum of money invested for 2 years at 5% per annum is Rs. 328. The simple interest on the sum, at the same rate and for the same period will be:
(a) Rs. 320
(b) Rs. 308
(c) Rs. 300
(d) Rs. 287

Q3. A sum of money is invested at 20% compound interest (compounded annually). It would fetch Rs. 723 more if interest is compound half-yearly. The sum is
(a) Rs. 72,300
(b) Rs. 30,000
(c) Rs. 20,000
(d) Rs. 7,500

Q4. A tank of oil was 4/5 full. When 6 bottles of oil was taken out and 4 bottles of oil was poured into it, it was 3/4 full. How many bottles of oil can fill the tank?
(a) 10
(b) 20
(c) 30
(d) 40

Q5. The value of is
(a) 0
(b) 1
(c) 5
(d) 7

Q6. There would be a loss of 10% if an article is sold for 43.20. At what price should it be sold to gain 10%?
(a) Rs. 48.80
(b) Rs. 52.80
(c) Rs. 56.20
(d) Rs. 56.80

Q7. Two mobile phones are sold at Rs. 6000 each. The first mobile is sold at 20% profit and the other one at 25% loss. What is the percentage of loss or profit incurred during the deal?
(a) 7.7% loss
(b) 8.3% loss
(c) 9% loss
(d) 2% profit

Q8. If x tan 60° + cos 45° = sec 45° then the value of x² + 1 is
(a) 6/7
(b) 7/6
(c) 5/6
(d) 6/5

Q9. AB is the diameter of a circle with center O. P be a point on it. If ∠POA = 120°. Then, ∠PBO = ?
(a) 60°
(b) 50°
(c) 120°
(d) 45°

Q10. The average of 10 items was found to be 80 but while calculating, one of the items was counted as 60 instead of 50. Then the correct average would have been:
(a) 69
(b) 79.25
(c) 79
(d) 79.5


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