What is the unit rate if there are 1,890 calories in 9 servings?

9 servings = 1890
1 serving = 210 calories

An inverse relationship has the formula  where is the constant of proportionality. In the problem, the cost is inversely proportional to the number of people. Let (x) be the number of people and let (y) be the cost per person of the bus rental. Computing for the constant of proportionality,

Use this value of K to compute for the cost (y) if 60 people (x) went on the trip:

The answer is $22.00