There are several options to find the discount
The original price - The sale price x 100
The original price
We have
(21.95 - 15.88) x 100/(21.95) = 28 percent
Keeping in mind that full price 21.95 represents 100 percent of the cost
100 - (15.88/21.95 x 100) = 27.7 percent or 28 percent
You can check your answers as follows:
Use decimals for the percents
(1.0 - 0.277) x 21.95 = 15.88
And with respect to the requested rounding
(1.0 - .28) x 21.95 = 15.8
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