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y-ilośc g 5% r-ru
6%*1000g=60g
x+y=1000
0,1x+0,05y=60
x+y=1000
10x+5y=6000
y=1000-x
2x+y=1200
y=1000-x
2x+1000-x=1200
y=1000-x
x=200
x=200
y=800