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⁹/₁₂×2%x=0,75×0,02x=0,015x
0,015x-20% z 0,015x=0,015x-0,2×0,015x=0,015x-0,003x=0,012x
0,012x=180zł
x=180:0,012
x=15 000zł
spr.15000+0,75×0,02×15000=15000+225=15225
15225-15000=225zł= odsetki
225-20% z 225=225-0,2×225=225-45=180zł