## Elementary Algebra

A pound of Swiss chocolate costs 12.80 dollars. First, we need to convert this price from dollars per pound to dollars per ounce. To do this, we multiply $\frac{12.80\ dollars}{1\ pound}$ with the ratio that converts pounds to ounces. The ratio that converts pounds to ounces is $\frac{1\ pound}{16\ ounces}$. So, $\frac{12.80\ dollars}{1\ pound}$ $\times$ $\frac{1\ pound}{16\ ounces}$ = $\frac{12.80\ dollars}{16\ ounces}$ $\frac{12.80}{16}$ = 0.8 dollars The price for 1 ounce of Swiss chocolate is 0.8 dollars.