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) = 0.69(1.03)^x

Part A: Is the price of product A increasing or decreasing and by what percentage per year? Justify your answer. 

Part B: The table below shows the price f(t), in dollars, of product B after t years:

t (number of years)1234f(t) (price in dollars)10,10010,20110,303.0110,406.04

What product recorded a greater percentage change in price over the previous year? Justify your answer.