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painter rented a wallpaper steamer at 9 a.m. and returned it at 4 p.m. He paid a total of $28.84. What was the rental cost per hour?

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Pixelbox
he had it for a total of 7 hours. 28.84 divided by 7 equals 4.12 an hour.(i did it in my head, let me know if i was wrong please)
Supernova

9am to 4pm is 7 hours (10am, 11am, 12pm, 1pm, 2pm, 3pm, 4pm).

Divide $28.84 by 7 hours.

28.84/7 = 4.12

The rental cost per hour was $4.12.

[tex] \boxed {\$4.12/hour} [/tex]

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