Subject: mathqa
Question: a car dealership has 40 cars on the lot , 15 % of which are silver . if the dealership receives a new shipment of 80 cars , 45 % of which are not silver , what percentage of total number of cars are silver ?
Option: 
A: 30 %
B: 40 %
C: 35 %
D: 50 %
Answer: C