Answer:
D.
Increase by more than 0.25 dollars.
Step-by-step explanation:
What is the gross margin %?
Margin % = (2.50/1.00) * 100 = 250%
If the cost goes up 0.25 what will the selling price have to do to maintain a markup of 250%?
250% =(x/1.25) * 100%
Divide by 100%
250 / 100 = x / 1.25
2.5 = x / 1.25
Multiply both sides by 1.25
2.5 * 1.25 = x
3.125 = x
But that is really not the question. The question is, how much higher is that now than it used to be?
3.125 - 2.50 = 0.625 cents.
So you would have to increase the selling price by more than 0.25