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1 kg- 7,85 zł
0,45 kg - x zł
x = 7,85 zł * 0,45
x = 3,53 zł
2.
650 zł - 100 % (1)
x zł - 20 % ( 0,2)
x = 650 zł * 0,2
x = 130 zł
Odp. Gitara potaniała o 130 zł.
kg=7.85=100dag=100%
45dag=45%
7.85=100%
x=45%
x=(45*7.85)/100=353,25/100=3,53zl
zad2
100%=650zl
20%=x
x=20*650/100=13000/100=130
130zl obnizka