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x - pewna liczba
2x = 1/4 x + 28
2x - 1/4 x = 28
7/4 x = 28
x = 16
zad. 2
12% prez dwa miesiace to
(12/12)*2 = 2%
5000 * 2% = 100
2x=25%x+28
2x=0,25x+28/ -0,25x
1,75x=28/ : 1,75
x=16
2) d=kpt/100
d- odsetki = ?
k- kapitał= 5000zł
p- procent= 12%
t- czas ( lata)= 2:12=1:6
d=5000*12*1:6:100=100
Odp. Otrzyma 100 zł odsetek.