Measuring 39011

Miška wants to buy wrapping paper for a gift for her mother. How many euros will he pay if he wants to buy paper measuring 9 quarters of a meter and 8-fifths of a meter, and one square meter of wrapping paper costs 40 cents?

Correct answer:

x =  1.44 Eur

Step-by-step explanation:

$$\begin{gathered} a=\frac{9}{4}=2.25\text{m} \\ b=\frac{8}{5}=1.6\text{m} \\ c=0.40{\text{Eur/m}}^2 \\ S=a\cdot b=\frac{9}{4}\cdot \frac{8}{5}=\frac{9\cdot 8}{4\cdot 5}=\frac{72}{20}=\frac{18}{5}=3.6{\text{m}}^2 \\ x=S\cdot c=3.6\cdot 0.4=\frac{36}{25}\text{Eur}=1.44\text{Eur} \end{gathered}$$

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