Question

Help from smart people will be very welcomed c:

The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time.The price f(x), in dollars, of product A after x years is represented by the function below.
f(x) = 72(1.25)x
Part A: Is the price of product A increasing or decreasing and by what percentage per year? Justify your answer.

Answer 1

Part B: The table below shows the price f(t), in dollars, of product B after t years.
(number of years) 1 2 3 4
f(t) (price in dollars) 65 84.5 109.85 142.81
Which product recorded a greater percentage change in price over the previous year? Justify your answer.

Answer 2

oh my gosh I've seen this same exact question, probably just about a week ago, actually. I tried helping, all I could rally help with was A. Part B was slightly confusing to me.
A) it increases but I don't know what percentage.
Sorry, this is not my area of expertise

Answer 3

Thanks :P

What about B? Can you help with b?