X - The total cost
3 persons
Below $120 p/p
Then
120 * 3 = 360
X < 360/3
The number in brackets represents the percentage change
1.045
the 1 shows that it is an increase and the .045 shows the percent
for example 1.55 would be 55% increase and 1.555 would be 55.5% increase
Use the exponential function of f(x)= 100x times (1.08)^2