Socks

One pair of socks worth CZK 27. Set of 3 pairs of these socks are sold with 10% discount. How many will we pay CZK for two offered sets of socks?

Correct answer:

x =  145.8 Kc

Step-by-step explanation:

$$\begin{gathered} p=27 \\ s=3\cdot p\cdot (1-10\mathrm{/}100)=3\cdot 27\cdot (1-10\mathrm{/}100)={\displaystyle \frac{729}{10}}=72.9 \\ x=2\cdot s=2\cdot 72.9={\displaystyle \frac{729}{5}}={\displaystyle \frac{729}{5}}\text{ Kc}=145.8\text{ Kc} \end{gathered}$$

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