A bag marked at $150 is sold for $120. The rate of discount is?  Choose the correct choice
A) 10%
B) 25%
C) 20%
D) 50%
E) 45%
Rate of discount = 30/150 * 100= 
<gadget id="calculator">30/150 * 100</gadget>
<output>20</output>
20%   Answer is 20%
<result>C</result>
A bag marked at $150 is sold for $120. The rate of discount is?