A practising chartered accountant now spends `10 per km on taxi fare for his client’s work. He is considering two other alternatives: the purchase of a new small car or an old big car. The estimated...

A practising chartered accountant now spends `10 per km on taxi fare for his client’s work. He is considering two other alternatives: the purchase of a new small car or an old big car. The estimated costs figure are:

He estimates that he covers 10,000 kms annually. Which of these alternatives will be cheaper? If his practice expands and he has to cover 19,000 kms per annum, what should be his decision?