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0,2 * 30 = 6
6 ----- 30%
x ------ 100%
30x = 6*100
30x = 600
x = 20
b)
0,05 * 8 = 0,4
0,4 ----- 4%
x ----- 100%
4x = 40
x = 10
c)
1,1 * 24 = 26,4
26,4 ------ 44%
x ------- 100%
44x - 2640
x = 60