A pair of new headphones cost $20 to make. They get marked up in price 250% by a retail store before they  are sold. How much will the headphones cost?

$50

Step-by-step explanation:

Change 250 to a decimal:

250/100 = 2.50

multiple the price by this decimal to find the new price:

$20 x 2.50 = $50

to find the unit price, we must figure out the cost of one item (in this case one dish towel).   to do this, we divide the total price ($7.92) by the number of items bought (for this problem it is 8, because there are eight dish towels in one pack).  

$7.92/8 = $0.99

therefore, the unit price, or the price of one dish towel, is $0.99.

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