A retailer bought a shirt at wholesale and marked it up 80% to its initial price of $45. By how many more dollars does he need to increase the price to achieve a 100% markup?  Pick one
A) 1
B) 2
C) 3
D) 4
E) 5
x is the buy price. x+80%x = 1,8x is the sale price = 45 so x, the buy price becomes 45/1,8=25   %100 mark up means x+100%x=2x so 50. 50-45=5   ANSW5R:5
<result>E</result>
A retailer bought a shirt at wholesale and marked it up 80% to its initial price of $45. By how many more dollars does he need to increase the price to achieve a 100% markup?