To fill in the second table, divide to find the "fractional" oil change done "per week". For instance, if I get my oil changed every two weeks, then I get "half" an oil change "per week". If I get "half" an oil change and my neighbor gets "one-third" of an oil change, then the two of us together get 1/2 + 1/3 = 5/6 of an oil change per week.

a) What are the total oil changes per week for these 100 people?

Add the "total" column's values.

b) What are the total oil changes per week for the 1200 people in this town.

If the 100 are representative of the 1200, multiply the 100's number to get the 1200's number.

c) If an oil change is $30 how much will the town spend on oil changes per week?

Multiply the oil changes by the price per change.

d) Could you make a profit on a Quick Lube in this small town? Why? Why not?

Since you have no information about costs, there is no way to know whether this income is sufficient. Sorry!

If you get stuck on the parts that

*can* be answered, please reply with a clear listing of your work and reasoning so far. Thank you!

Eliz.