The demand function for an auto parts manufacturing company is given by f(x) =100,000 - 2,500 , where x represents price and f(x) represents quantity. .F^-1= In the inverse function, the variable x represents? .

Explanation is in the file

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To answer the question, first solve for the difference between the two number of cars. That is, 48 - 64 which is equal to -16. Divide this value by the original number of cars and multiply by 100%. 
                                   (-16 / 64) x 100% = -25%
Therefore, the percent decrease of the number of cars is 25%.