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5% / 100% = 0,05
7% / 100% = 0,07
0,05x + 4 = 0,07x
0,07x - 0,05x = 4
0,02x = 4 /: (0,02)
x = 4/0,02
x = 200
2%=4 <---------i to tez :)
100%-200
5 % z 200 to 10
7% z 200 to 14 :)
ta liczba to 200 :D