simple word problem #1

You buy a phone card and it charges $1.19 for the first 10 min. and $0.09 per min after that. How much would a 22 min. phone call cost ?

$\text{cost } = 10~\text{min}\cdot \frac{$ 1.19}{10~\text{min}} + 12~\text{min}\cdot \frac{$ 0.09}{1~\text{min}}\\ \text{cost } = $1.19 + $1.08\\ \mathbf{\text{cost } =$2.27}\\$