If 85% of E type cars produced during 1996 and 1997 are being sold by the company, then how many E type cars are left unsold by the company?

Production of E type cars in 1996 = (100 − 80)% of 450000
Production of E type cars in 1996 = 20% of 450000 = 90000
And in 1997 = 10% of 520000 = 52000
∴ Total production = 90000 + 52000 = 142000.
∴ Required number of cars = 15% of 142000 = 21300