The publisher

The publisher prepares the release of the dictionary. Print preparation costs no matter the number of printed copies of 150000 CZK. The printer charges 80 CZK for one print.
A) What are the costs of one dictionary if 5000 copies printed?

B) For what number of dictionaries will the costs for one issue of CZK 95 be?

Correct result:

a =  110 Kc
b =  10000

Solution:

$$\begin{gathered} f(n)=(150000+80n)\mathrm{/}n=150000\mathrm{/}n+80 \\ a=f(5000) \\ a=150000\mathrm{/}5000+80=110\text{ Kc} \end{gathered}$$

$$\begin{gathered} f(b)=95 \\ 150000\mathrm{/}b+80=95 \\ 150000+80\cdot b=95\cdot b \\ 15b=150000 \\ b=10000 \end{gathered}$$

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