$$A=B*L
B=Breite
L=Länge$$
$$A=(3m *5,2m)
A=15,6 m^2$$
$$P= A*K
P=Preis
A= Fläche
K= Kosten pro Fläche$$
$$P= A*K = 15,6 m^2 *11 (Euro/m^2)$$
$${\mathtt{P}} = {\mathtt{15.6}}{\mathtt{\,\times\,}}{\mathtt{11}} \Rightarrow {\mathtt{P}} = {\mathtt{171.6}}$$
gruß
Gandalf the green