What is 120% of 2,000

For the equations below which statement is true ?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?