S = a * b
a - ширина ; b - длина
S = 8 * 15 = 120
S2 = (8+6) * 15 = 210
1% = 1.2
210 - 120 = 90
90 / 1.2 = 75 %
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S = a * b
a - ширина ; b - длина
S = 8 * 15 = 120
S2 = (8+6) * 15 = 210
1% = 1.2
210 - 120 = 90
90 / 1.2 = 75 %