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0,7 -- x
x = 17%
3,5 -- 100
0,5 -- x
x = 14%
4,20 -- 100
0,2 -- x
x= 5%
4,20 - 3,50 = 0,70
0,70/4,20*100% = 17%
b)
4,00 - 3,50 = 0,50
0,50 / 4,00*100% = 12,5%
c)
4,20 - 4,00 = 0,20
0,20 / 4,20 * 100% = 5%