1)75 40%=75×40:100=30
2)36=80xX 36×100:80 X=45
3)42=Xx35 x=42×100:35 x=120
4)450 80% 45×80:100=36
5)120=100 30%=100+30% x=130%
6)175=100 60%=100-60% x=40%
7)X=84×100:70 X=120 120-100=20
8)208×100:320 X=16.640 16.640+100=16.740
9)90×20:100 X=18 100-18=82
10)144%-40=104% 40 104% X=40×104:100 X=1/4
