MCQOPTIONS
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| 1. |
A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years = ? |
| A. | 14 years |
| B. | 28 years |
| C. | 21 years |
| D. | 10 years |
| Answer» B. 28 years | |