Question 1171613
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x = number of donuts made


1 donut costs $0.15 to make
making x of them cost 0.15x dollars
This is the variable cost.


Add this on top of the $10,000 fixed cost and we have 0.15x+10000 representing the total cost.


Divide this over x to get the average cost 
(0.15x+10000)/x


we want this average cost to be $3.00
So we set that x expression equal to 3 and solve for x


(0.15x+10000)/x = 3


0.15x+10000 = 3x


10000 = 3x-0.15x


10000 = 2.85x


2.85x = 10000


x = 10000/2.85


x = 3508.77 approximately


It's not possible to make 0.77 of a donut so we round up to get x = 3509


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Answer:  3509 donuts

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