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b)75(x+y)/100
c)140y/100
d)90x/100
b) 0.75x+y
c)1,4 y
d)0,9x
b) 75% z (x+y) = ¾x+¾y= ¾(x+y)
c) 140% z y = 1,4y
d) 90% z x = 0,9x