AlgebraEasyBreak-even from a profit equation
Algebra practice question
A stall's profit p, in dollars, from selling c cups of coffee is given by p = 2c − 10. How many cups must be sold for the profit to be exactly 0?
Answer: 5
2c − 10 = 0 gives 2c = 10, so c = 5.
Common wrong answers
- If you answered 10
- 10 is the fixed cost, not the number of cups.
- If you answered 20
- 20 doubles 10 instead of halving it.
- If you answered -10
- −10 is the profit when no cups are sold.
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