Subject: mathqa
Question: a furniture dealer purchased a desk for $ 150 and then set the selling price equal to the purchase price plus a markup that was 20 % of the selling price . if the dealer sold the desk at the selling price , what was the amount of the dealer ' s gross profit from the purchase and the sale of the desk ?
Option: 
A: 25 %
B: 40 %
C: 35 %
D: 30 %
Answer: A