$25\text{dag}-12,75\text{zł}$

$40\text{dag}-x\text{zł}$

$x=\frac{{}^8\bcancel{40}\cdot 12,75}{{\bcancel{25}}_5}=\frac{102}{5}=20,40$

$40\text{dag}$ moreli kosztuje $20,40\text{zł}$.

$1\text{kg}=100\text{dag}$

$25\text{dag}-12,75\text{zł}$

$100\text{dag}-y\text{zł}$

$y=\frac{{}^4\bcancel{100}\cdot 12,75}{{\bcancel{25}}_1}=51$
$1\text{kg}$ moreli kosztuje $51\text{zł}$.