John marko buys a car $11,400.00. in three years the car depreciates 48% in value. how much is the car worth in three yoears?

Hi

100% - 48% = 52% 

11,400 ⇒ 100%
x ⇒ 52%

100x = 52 · (11,400)
100x = 592,800
x = (592,800)/100
x = $ 5,928.00 ⇒ value of the car after 3 years

11,400 - 5,928 = $ 5,472.00 ⇒ depreciation in the value

Value of the car that John Marko buys = $11400.00
Percentage of depreciation in the value of the car in 3 years = 48%
Then
The amount of depreciation in the value of the car in 3 years = (48/100) * 11400
                                                                                                  = 48 * 114
                                                                                                  = 5472 dollars
The value of the car after 3 years = ( 11400 - 5472) dollars
                                                       = 5928 dollars.
So the value of the car after 3 years is $5928. I hope the procedure is simple enough for you to understand.