Kaufland sales-off

As a rule, the goods are approaching the end of consumption in Kaufland three days before the consumption ends 30% off and one day before the consumption ends 50% discounts. Sometimes, however, the seller has been mistaken, and the second discount is already computed from the discounted goods. When the seller has been mistaken, calculate how much the total discount is.

Correct answer:

p =  65 %

Step-by-step explanation:

$$\begin{gathered} c_1=1-30/100=\frac{7}{10}=0.7 \\ {c}_2=1-50/100=\frac{1}{2}=0.5 \\ {c}_3=c_1\cdot c_2=0.7\cdot 0.5=\frac{7}{20}=0.35 \\ p=(1-c_3)\cdot 100=(1-0.35)\cdot 100=65\% \end{gathered}$$

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