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2014-09-21T14:54:20+03:00
24 lei.......................100%
21 lei........................x%
x=21*100/24
x=87,5 %
1 3 1
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2014-09-21T14:55:32+03:00
24-21=3

24.....100%
3..... x %
___________
x=3x100/24
x=300/24
x=12,5%
1 5 1