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15zl*3=45zl
100[%] - 45[zl]
90[%] - x
100x=90*45=4050 /:100
x=40,5[zl] -koszt za 3 bilety po obnizce 10%
koszt za 4 bilety po obnizce
15zl*4=60zl
100[%] - 60[zl]
85[%] - x
100x=85*60=5100 /:100
x=51[zl]
51zl-40,5zl=10,5zl
Za cztery bilety trzeba zaplacic o 10,5zl wiecej niz za trzy.