with a coupon you can get a pair of shoes that normally costs 84$for only 72$ what the amount of money that is the discount​

84 is equal to 100% of the price, and if x is our discount 84x = 72 to find x rearrange the equation so x is alone : x = 72/84 which can be simplified to 6/7 or 0.857. multiplying this by 100 gives the percentage 85.7% which can be simplified to 86% if the answer is only looking for 2 significant figures.

To check the answer is correct you can do 84 x 6/7 = 72

72\84= 0.85
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0.85* 100= 85.7
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100-58.7= 14%
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I think this is the answer