Advanced MathMediumTwo increases of 20%
Advanced Math practice question
A plant's height increases by 20% each month. It is 30 centimetres tall now. How tall, in centimetres, will it be in 2 months?
Answer: 43.2
30 × 1.2² = 30 × 1.44 = 43.2.
Common wrong answers
- If you answered 36
- 36 is after ONE month.
- If you answered 42
- 42 adds 20% of 30 twice (linear); the second 20% is of 36.
- If you answered 72
- 72 multiplies 30 by 2.4 (adding the factors instead of multiplying).
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