Jithin bought six books at an average price (arithmetic mean) of 20$. If jithin returned two books to the retailer, at an average price of the remaining book was 14.5$, then what is the average price, in dollar, of the two returned books ?  Choose the correct choice
A) 25 B) 26.5 C) 27 D) 28 E) 29
Total price of six books = 6*20= 
<gadget id="calculator">6*20</gadget>
<output>120</output>
120$   Total price of four books= 4*16= 
<gadget id="calculator">4*16</gadget>
<output>64</output>
64$   Total price of two books= 120-64= 
<gadget id="calculator">120-64</gadget>
<output>56</output>
56$   Average price of two books= 56/2= 
<gadget id="calculator">56/2</gadget>
<output>28</output>
28$   Correct option Answer:28
<result>D</result>
Jithin bought six books at an average price (arithmetic mean) of 20$. If jithin returned two books to the retailer, at an average price of the remaining book was 14.5$, then what is the average price, in dollar, of the two returned books ?