Pole jednego rombu
[tex]80cm = 8dm[/tex]
[tex] \frac{e \times f}{2} = \frac{12 \times 8}{2} = 6 \times 8 = 48 {dm}^{2} [/tex]
Na 25 takich latawców
[tex]25 \times 48 {dm}^{2} = 1200 {dm}^{2} = 12 {m}^{2} [/tex]
Zatem zapłacimy
[tex]12 {m}^{2} \times 14 = \boxed{168zl}[/tex]
