The price of a hairpiece was increased from $500 to $550. what was the percent of increase? 9.1%. 10%. 20%. 25%. none of these.

The answer is "10%".

price of a hairpiece was increased from $500 to $550

So, the difference is = 550 - 500 = $50

original price = $500

now, divide the difference between the prices by the original price:

50/500 = 1/10

now to get percentage multiply it with 100;

1/10 x 100 = 10%