Show all work please. Solve with excel or by hand, both is preferable.

Example - We're planning to buy a car in 6 years, the price now is $18,000, the inflation rate is i=5%, There is an account with interest rate i=8% compounded monthly, we want to make 12 equal monthly investments starting now (i.e. only for the first year) so that we can cover the cost of the car in 6 years from now