A retailer bought a shirt at wholesale and marked it up 80% to its initial price of $27. By how many more dollars does he need to increase the price to achieve a 100% markup? Select:  A) 1  B) 2  C) 3  D) 4  E) 5
Let x be the wholesale price.   Then 1.8x= 27 and x = 27/1.8= 
<gadget id="calculator">27/1.8</gadget>
<output>15</output>
15.   To achieve a 100% markup, the price needs to be $30.   The retailer needs to increase the price by $3 more.   The answer is 3.
<result>C</result>
A retailer bought a shirt at wholesale and marked it up 80% to its initial price of $27. By how many more dollars does he need to increase the price to achieve a 100% markup?