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80%*20dag =16dag=160g
2.b
30%*400g=120g=12dag
3.c
45%*10000zł=4500zł
4.d
12:60*100%=0,2*100%=20%
5.c
rok ma 4 kwartały
3:4*100%=0,75*100%=75%
6.a
x*(100%-40%)=150zł
0,6x=150zł
x=150:0,6
x=60