The TV

The TV costs CZK 9,999. First, they reduced her price by 15%, then they became more expensive by 15%. How much does television cost now?

Correct answer:

c =  9774.02 Kc

Step-by-step explanation:

$$\begin{gathered} a=9999\text{ Kc } \\ {q}_1=15\mathrm{\%}=1-{\displaystyle \frac{15}{100}}=0.85 \\ {q}_2=15\mathrm{\%}=1+{\displaystyle \frac{15}{100}}=1.15 \\ b=a\cdot q_1=9999\cdot 0.85=8499.15\text{ Kc } \\ c=b\cdot q_2=8499.15\cdot 1.15=9774.02\text{ Kc}=9.8\cdot 10^3\text{ Kc} \end{gathered}$$

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