Úloha ID 9 - 
Vstupenky na koncert byly zlevněny: po slevě stálo 6 vstupenek stejně, jako předtím čtyři.
O kolik procent byly vstupenky zlevněny? (Odpověď zaokrouhlete na celé číslo.)
Správná odpověď je: C
Zvolíme si cenu vstupenky před slevou (4 a 6 − bude dobré zvolit si 12).
Pokud stála před slevou 12 Kč, tak 4 stály 48 Kč. 48 : 6 = 8 Kč.
100% .... 12Kč
x% ........ 8 Kč
x = 100 · 8 : 12 = 66.6 % původní ceny. Sleva tedy byla 33,3%.
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