What was the difference in the production of C type cars between 1996 and 1997?

Production of C type cars in 1996 = (70 − 40)% of 450000
Production of C type cars in 1996 = 30% of 450000 = 135000
Production of C type cars in 1997 = (65 − 40)% of 520000
Production of C type cars in 1997 = 25% of 520000 = 130000
∴ Required difference = 5000.