Answer:
0.109¢
Step-by-step explanation:
We can represent the proportional relationship between the monthly cost of cell phone service and the minutes of service given with a ratio:
cost : minutes
$1 : 920
To find the monthly cost per minute, we can divide both sides of the ratio by 920 to get a unit ratio and look at the resulting cost:
cost : minutes
($1 / 920) : (920 / 920)
$0.00109 : 1
So, the monthly cost per minute is approximately $0.00109 or 0.109¢.
