At compound interest, if a certain sum of money given by Ambuj to Pankaj it becomes two times in t years, then the amount will be four times in what time (in years).

- 3t years
- 2t years
- 4t years
- 8t years

Option 2 : 2t years

**Given **

Two times of money become = t year

**Calculation**

Let principle be 1 unit

Principal |
Amount |
Time |

1 | 21 | t |

1 | 22 | 2 × t years |

**∴ The principal becomes 4 times in 2t years **

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