Let's first determine how much 10 would cost at the normal price of 59 cents. This would be 590 cents.
Secondly, let's find the cost at the sale price. If 2 cost 99 cents, and we want 10, let's rephrase and say we want 5 pairs and each pair costs 99 cents. So 5x99 should be our answer. The easiest way to do this arithmetic is to pretend we're doing 5x100, which equals 500. However, we overshot by 1 cent for each of the 5 pairs, so the real total is 495.
So what's the difference between 590 and 495? Looks like 95 cents, so the correct answer is B.
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