The average number of vehicles of type B produced in 2015, 2016 and 2017 is approximately what per cent less than the number of vehicles of type A produced in 2017?

The number of cars produced by the company are as follows:

Total number of Type B vehicles produced in 2015, 2016 and 2017 = (225000 + 255000 + 270000) = 750000

Average number of Type B vehicles produced in 2015, 2016 and 2017 = $$\ \dfrac{750000}{3}=250000$$

Number of vehicles of Type A produced in 2017 = 385000

Difference between the number of vehicles of Type A produced in 2017 and the average number of Type B vehicles produced = 385000 - 250000 = 135000

Percentage = $$\ \dfrac{135000}{385000}\times100=35.06\%$$

Hence, the average number of Type B vehicles produced in 2015, 2016 and 2017 is 35.06% less than the total number of Type A vehicles produced in 2017. 

$$\therefore\ $$ The required answer is C.