Sorry, my previous answer had an error towards the end. 15% off is 100% - 15% or 85%
177 * (100 - 15) / 100 = 177 * 85 / 100 = 177 * 17 / 20 = 150.45
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177
13.72 x .15 = 2.06 (percent off)
15 percent off of 399 results in 339.15
15 percent off of $11.50 is $1.72.
70 percent of 15 is 10.50 so 70% off of 15 is 4.50.