Chocolate

Chocolate, which originally cost 1.5 euros, was increased by 40%. How many euros did it cost?

Correct answer:

x =  2.1 Eur

Step-by-step explanation:

$$\begin{gathered} a=1.50\text{ Eur } \\ x=a+{\displaystyle \frac{40}{100}}\cdot a=1.5+{\displaystyle \frac{40}{100}}\cdot 1.5={\displaystyle \frac{21}{10}}={\displaystyle \frac{21}{10}}\text{ Eur}=2.1\text{ Eur} \end{gathered}$$

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