Subject: mathqa
Question: a furniture dealer purchased a desk for $ 180 and then set the selling price equal to the purchase price plus a markup that was 40 % 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: $ 80
B: $ 100
C: $ 40
D: $ 120
Answer: D