Question

The expression used to caculate

Answer 1

Ok, so

We know that the expression to calculate the cost, is given by:

cost = 100 + 4n, where n is the number of people.

We want to know the cost for 20, people, so we replace:

cost = 100 + 4(20)

cost = 100 + 80

cost = $180

Therefore, the cost for 20 people is $180