Christmas 81912

Mom got a 50ml perfume for her birthday for 1,000 CZK. For Christmas, she received 100 ml of perfume for 1800 kc. How much is 1 ml of each perfume in CZK? Which one is cheaper?

Correct answer:

c₁ =  20 Kc/ml
c₂ =  18 Kc/ml
x =  2

Step-by-step explanation:

$$\begin{gathered} V_1=50\text{ml} \\ A=1000\text{Kc} \\ {V}_2=100\text{ml} \\ B=1800\text{Kc} \\ {c}_1=A/V_1=1000/50=20\text{Kc/ml} \end{gathered}$$

$c_2=B/V_2=1800/100=18\text{Kc/ml}$

$$\begin{gathered} c_2<c_1 \\ x=2 \end{gathered}$$

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