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0.3*700=210
700+210=910
20%=0.2
0.2*910=182
910+182=1092zł
20%- 0,2
30%- 0,3
x-0,2x-0,3x=700
0,5x=700
x=700:0,5
x= 1400 zł
Pozdrawiam i liczę na naj:)