A book is bought for $60 and sold for $78. What is the profit in percentage? Pick one:
A) 10
B) 20
C) 30
D) 40
E) 50
78/60= 
<gadget id="calculator">78/60</gadget>
<output>13/10 = around 1.3</output>
1.3   The answer is 30.
<result>C</result>
A book is bought for $60 and sold for $78. What is the profit in percentage?