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(x/2 - 1)%--------144
x/2 -1 = (144 x 100)/400
x/2-1=36
x/2=37
x=2x37=74
Entonces x/2 - 1=74/2 - 1 = 36%
Bueno si es "x" lo que te piden es 74, si es (x/2 - 1) = 36%