A car dealership has 40 cars on the lot, 10% of which are silver. If the dealership receives a new shipment of 80 cars, 25% of which are not silver, what percentage of total number of cars are silver?
Choose one:
A) 15%
B) 18%
C) 20%
D) 21%
E) 22%
The number of silver cars is 0.1*40 + 0.25*80= 
<gadget id="calculator">0.1*40 + 0.25*80</gadget>
<output>24</output>
24   The percentage of cars which are silver is 24/120= 20%   The answer is 20%.
<result>C</result>
A car dealership has 40 cars on the lot, 10% of which are silver. If the dealership receives a new shipment of 80 cars, 25% of which are not silver, what percentage of total number of cars are silver?