Last week at the business where you work, you sold 120 items. The business paid $1 per item and sol

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Last week at the business where you work, you sold 120 items. The business paid $1 per item and sold them for $3 each. What profit did the business make from selling the 120 items?

Let n be the number of items. We have the following equations:

Cost Function C(n) = n
For n = 120, we have C(120) = 120

Revenue Function R(n) = 3n
For n = 120, we have R(120) = 3(120) = 360

Profit = Revenue - Cost
Profit = 360 - 120
Profit = 240