3a)
[tex]\it \dfrac{\ 690^{(10}}{5400} =\dfrac{\ 69^{(3}}{540} = \dfrac{23}{180}[/tex]
b)
[tex]\it p\%\ din 690=111 \Rightarrow \dfrac{p}{100}\cdot690=111 \Rightarrow p\cdot\dfrac{690}{100} =111 \Rightarrow
\\ \\ \\
\Rightarrow p=111\cdot\dfrac{10}{69} = \dfrac{370}{23} \approx 16\%[/tex]
