A retailer bought a hat at wholesale and marked it up 60% to its initial price of $24. By how many more dollars does he need to increase the price to achieve a 100% markup?
Choose the correct choice from the following
A) 3 B) 4 C) 5 D) 6 E) 7
Let x be the wholesale price.   Then 1.6x= 24 and x = 24/1.6= 
<gadget id="calculator">24/1.6</gadget>
<output>15</output>
15.   To achieve a 100% markup, the price needs to be $30.   The retailer needs to increase the price by $6 more.   The answer is 6.
<result>D</result>
A retailer bought a hat at wholesale and marked it up 60% to its initial price of $24. By how many more dollars does he need to increase the price to achieve a 100% markup?