A Car Wash Services 200 Customers an Hour on a Lovely

A car wash services 200 customers an hour on a lovely Saturday afternoon. The car wash employs 5 washers at $6 per hour and uses $50 of water and $5 of electricity per hour. They charge $10 per car for their standard wash job. Which of these changes would have the greatest positive impact on their productivity?

A) increasing their service rate by 10%
B) decreasing wages by 5%
C) increasing their per-car fee by 20%
D) decreasing water usage by 10%

Correct Answer:

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