Mathematics, 19.11.2020 06:00, kennakenken3

A repairman charges an inspection fee plus $20 per hour. A customer with a coupon for 40% off the inspection fee pays $110 for a 4-hour repair.
How many hours are worked when a customer pays $90 without a coupon?

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A repairman charges an inspection fee plus $20 per hour. A customer with a coupon for 40% off the i...