AlgebraEasy–MediumInverting a linear cost function
Algebra practice question
The cost, in dollars, of printing n leaflets is C(n) = 0.08n + 35. How many leaflets can be printed for exactly $75?
Answer: 500
0.08n + 35 = 75 → 0.08n = 40 → n = 500.
Common wrong answers
- If you answered 40
- 40 is the amount left for printing after the setup cost, in dollars, not leaflets.
- If you answered 1375
- 1375 comes from (75 + 35) ÷ 0.08, adding the setup cost instead of subtracting it.
- If you answered 937.5
- 937.5 comes from 75 ÷ 0.08, ignoring the $35 setup cost.
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