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Answer:
(e) $16/hour, $2560/month
Explanation:
At one assembly per 20 minutes, Art assembles 3 microscopes per hour. That means each hour he gets paid $1 + 3×$5 = $16.
There are 8×5 = 40 hours in a work week, and 4×40 = 160 hours in a month. Art's pay for the month will be ...
($16/h)(160 h) = $2560
Art's pay is $16 per hour, and $2560 per month.