In January, 2 liters of lemonade were sold for CZK 24, while in February, 2.5 liters of lemonade sold at same price. How much percent was 1 liter of lemonade cheaper in February than in January?

Correct result:

p =  20 %


c1=24/2=12 Kc/l c2=24/2.5=485=9.6 Kc/l p=100 c1c2c1=100 129.612=20%c_{1}=24/2=12 \ \text{Kc/l} \ \\ c_{2}=24/2.5=\dfrac{ 48 }{ 5 }=9.6 \ \text{Kc/l} \ \\ p=100 \cdot \ \dfrac{ c_{1}-c_{2} }{ c_{1} }=100 \cdot \ \dfrac{ 12-9.6 }{ 12 }=20 \%

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