Product Function Year 1 Year 2 Year 3
Product 1 f(x) = x³ 1 8 27
Product 2 g(x) = x² + 11 12 15 20
Product 3 h(x) = 4^x 4 16 64
Product 4 j(x) = 4x + 8 12 16 20
Product 3 exceeds the prices of other products. x is an exponent of 4, thus, the price increase is exponential.
Hope this helps :)