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Mathematics, 18.12.2020 20:00 harrisakeeyah

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 in...

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