Sandy bought 65 books for $1380 from one shop and 55 books for $900 from another shop. What is the average price that Sandy paid per book? Choose the correct option.
A) $13	B) $15	C) $17	D) $19	E) $21
average price per book = (1380 + 900) / (65 + 55) = 2280 / 120= 
<gadget id="calculator">2280 / 120</gadget>
<output>19</output>
$19   The answer is $19.
<result>D</result>
Sandy bought 65 books for $1380 from one shop and 55 books for $900 from another shop. What is the average price that Sandy paid per book?