Find the solution for in this equation:单项选择题

A
-4
B
-8
C
4
D
5
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Delmo Donuts sells donuts for $1.30 each. Over the past year, the highest monthly sales volume was 5,100 and the lowest monthly sales volume was 3,340. In the month where the highest sales were achieved, total costs were $4,870. In the month where the lowest sales occurred, total costs were $3,814. Delmo Donuts’ estimated variable cost per donut (to the nearest cent) is
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