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How many days of advertising should Nail Mania buy each week?

Assume Nail Mania advertises in the local newspaper. Each day it advertises costs $100. Over the past several months, Nail Mania has conducted market research and developed the following information

Number of days advertised per week Number of customers per week

0 100
1 200
2 290
3 355
4 375
5 390
6 400
7 400

If the net revenue (payments less cost of goods sold) is $5, how many days of advertising should Nail Mania buy each week? Explain your answer.

Solution Preview

0 100 x5 = 500 profit
1 200 x5 - 100 = 900 profit
2 290 x5 - 200 = 1250
3 355 x5 - 300 = 1475
4 375 x5 - 400 = 1475
5 390 x5 - 500 = 1450
6 400 x5 - 600 = 1400
7 400 x5 - ...

$2.19