At an online marketplace, Mr Idris earns a commission whenever he sells a standing desk. He earns 8% of the first $250 of the selling price and 16% of the selling price above $250. Mr Idris sold one standing desk and received a commission of $68.
- How much of the $68 commission was earned on the amount above $250?
- How much of the standing desk's selling price was above $250?
Need a hint?
First split the total commission according to the two rates. Then use only the commission earned at 16% to find the selling price above $250.
Worked answer
- 8% of $250 = $20.
- $68 − $20 = $48, the commission earned on the amount above $250.
- $48 ÷ 16% = $300, so the amount above $250 was $300.
Answer: $300
The mistake this question tests
Habit
Calculation slip
A common mistake is to divide the whole $68 by 16%. This wrongly treats all the commission as being earned at the second rate.
How to fix it at home →Wrong answers children often give:
- $425 Calculation slip
- $600 Calculation slip
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