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150÷0,2=750zł
215÷0,15=1433,3
1200÷0,1=12000m
100 - 12%
x - 100%
12*x=100*100
12x=10000/12
x= w przybl 833.3 %
b)
20%-150zl
100%-x
20x=100*150
20x=15000/20
x=750
c)
15%-215
100%-x
15x=21500
x=w przybl 1433,3
d)
1200 -10%
x- 100%
10x=120000/10
x=12000