Percentage 65844

Mr. Josef sold home-grown potatoes at 79 cents per kilogram. When he had the last 5 kg, he told the customer: collect them all for 3 euros!
By what percentage did Mr. Josef reduce the potatoes?

Correct answer:

p =  24.1 %

Step-by-step explanation:

$$\begin{gathered} c_1=0.79\text{eur/kg} \\ {c}_2=3/5=\frac{3}{5}=0.6\text{eur/kg} \\ p=100\cdot \frac{c_1-c_2}{c_1}=100\cdot \frac{0.79-0.6}{0.79}=\frac{1900}{79}\%=24.1\% \end{gathered}$$

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