Answer:
 The amount of the markup is $48 + $48 (0.55) . 
Option (C) is correct .
Explanation:
As given 
An item is purchased for a wholesale price of $48 and will be sold at a 55 percent markup.
 55% is written in the decimal form . 

= 0.55
Thus 
Markup price = 0.55 × wholesale price of item . 
 = 0.55 × $48 
 = $48 (0.55) 
Thus 
Price of item after markup = Wholesale price of item + Markup price
 = $48 + $48 (0.55) 
Therefore the amount of the markup is $48 + $48 (0.55) . 
Option (C) is correct .