Answer:
a) r(b) = 75b
b) c(b) = 30b +500
Explanation:
Revenue is the product of the selling price per unit and the number of units. The cost will be the sum of fixed (overhead) cost and production cost per unit multiplied by the number of units produced.
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Let b represent the number of skateboards Jesse produces in a month.
a)
Jesse receives $75 for each skateboard sold. Her revenue from selling 'b' skateboards is ...
r(b) = 75b
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b)
It costs Jesse $30 for each skateboard produced, and $500 for overhead. Her total cost is ...
c(b) = 30b +500
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Additional comment
In order to break even, Jesse's revenue must equal her cost:
75b = 30b +500
45b = 500
b = 11 1/9
Jesse must produce and sell 12 skateboards each month to cover her costs. (In a real business, there are additional considerations related to inventory, shrinkage, returns, discounts, and other things that may increase cost or reduce revenue.) After covering costs, each additional skateboard sold will give Jesse a profit of $45.