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d=1,2b
P1 = a * b = 1 * 1 = 1
P2 = c * d = 0,9 * 1,2 = 1,08
P2/P1 = 1,08 - 1 = 0,08
0,08 * 100 % = 8%
100 % + 8 % = 108 %