We take 88% instead of 12% because at the end of each year the cost of the car is 88% of the previous year
So I did this
Let's x be the amount after n year's so
22,500*0.88^n = x
As given in the question above we have n = 5
So 22,500*0.88^5 = x
22,500*0.5277319168 = 11837.96
The car should be worth about 11837.96.