GMAT數學難題!煩請數學達人指教!

A used-car dealer sold one car at a profit of 25 percent of the dealers purchase price for that car and sold another car at a loss of 20 percent of the dealers purchase price for that car. If the dealer sold each car for $20000, what was the dealers total profit or loss, in dollars, for the two transactions combined?

a $1000 profit
b $2000profit
c $1000 loss
d $2000 loss
e $3334 loss

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