At a certain rate of simple interest, a certain sum of money becomes double of itself in 10 years. It will become treble of itself in
A). 15 years
B). 18 years
C). 20 years
D). 30 years
20 years
NA
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1. Mr. Thomas invested an amount of Rs. 13,900 divided in two different schemes A and B at the simple interest rate of 14% p.a. and 11% p.a. respectively. If the total amount of simple interest earned in
2. A certain sum of money is invested for one year at a certain rate of simple interest. If the rate of interest is 3% higher, then the invest earned will be 25% more than the interest earned earlier. Wh
3. Alloy A contains 40% gold and 60% silver. Alloy B contains 35% gold and 40% silver and 25% copper. Alloys A and B are mixed in the ratio of 1:4 .What is the ratio of gold and silver in the newly form
4. For what sum will the simple interest at R% for 2 years will be R?
5. A sum becomes Rs. 11,760, in 8 years at 12% per annum on simple interest. What is the principal ?
6. A sum of Rs. 5000 was lent at 6% per annum and Rs. 6000 at 7% per annum simple interest. After what time would the total interest be Rs. 2160?
7. Mohan lent some amount of money at 9% simple interest and an equal amount of money at 10% simple interest each for two years. If his total interest was Rs.760. what amount was lent in each case
8. A man borrowed a certain sum of money for 8 years. If the simple interest on the sum after 3 years is Rs. 840, how much simple interest he had to pay after 8 years?
9. A four years NSC certificate was purchased for Rs. 500 with Rs. 1000 being the maturity value. Find the rate of S.I.
10. Product of digits of a 2-digit number is 18. If we add 63 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.
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