A car dealership has 40 cars on the lot, 15% of which are silver. If the dealership receives a new shipment of 80 cars, 30% of which are not silver, what percentage of total number of cars are silver? Choose the correct choice from the following answers
A) 20 %
B) 25 %
C) 30 %
D) 35 %
E) 40 %

Rationale: "the number of silver cars is 0.15 * 40 + 0.3 * 80 = 30 the percentage of cars which are silver is 30 / 120 = 25 % the answer is b ."
Answer: B