Problem 7a

Given information

The basic assumption needed to estimate the number of mechanics in a certain region.

1. A rough idea of population of the city is needed.
2. The assumption of number of cars used by each person in the city.
3. The assumption of number of cars that a mechanic able to repairs in a day.
4. The assumption of number of workdays of mechanics in a year.
5. The assumption of number of service of a car required in a year.

Step-by-step explanation

The population of San Francisco is nearly about  870206 people.

Assume,

If there is 1 car for every 2 person.

The average capacity of mechanic to repair is 4 cars per day.

Assuming an average working days of mechanics is 260 days per year.

If a car needs to be repaired thrice per year.