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If the radius of the base, and the height of a right circular cone are increased by 20%, what is the approximate percentage increase in volume?
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- 60
- 68.8
- 72.8
- 75
- 60
Correct Option: C
| Volume of cone = | πr²h | |
| 3 |
| Single equivalent increase in radius = |  | 20 + 20 + |  | % = 44% | |
| 100 |
Single equivalent percentage effect for 44% and 20%
| = | | 44 + 20 + | | % = (64 + 8.8)% | |
| 100 |
= 72.8%
= Increase in volume
