For this case we have an equation of the form: y = A * (b) ^ t Where, A: initial cost b: growth rate t: time in years Substituting values we have: y = 7500 * (1.1275) ^ t For year 6 we have: y = 7500 * (1.1275) ^ 6 y = 15408.50724 Answer: y = 7500 * (1.1275) ^ t y = 15408.50724 $ (year 6)