Applicare la formula: $\frac{a}{b}c$$=\frac{ca}{b}$, dove $a=7$, $b=12$, $c=\frac{7}{100}$, $a/b=\frac{7}{12}$ e $ca/b=0.07\cdot \left(\frac{7}{12}\right)$

Applicare la formula: $ab$$=ab$, dove $ab=0.07\cdot 7$, $a=\frac{7}{100}$ e $b=7$

Applicare la formula: $\frac{a}{b}$$=\frac{a}{b}$, dove $a=\frac{49}{100}$, $b=12$ e $a/b=\frac{0.49}{12}$