When you describe a quantity with more than one familiar unit (such as kilometers or millimeters for a length), how can you decide which is a more appropriate unit to use? while it is not incorrect to use the less appropriate unit, why do you want to avoid using it anyway?

Franklin painting company is considering whether to purchase a new spray paint machine that costs $4,800. the machine is expected to save labor, increasing net income by $720 per year. the effective life of the machine is 15 years according to the manufacturer’s estimate. required determine the unadjusted rate of return based on the average cost of the investment.

The school cafeteria can make pizza for approximately $0.30 a slice. the cost of kitchen use and cafeteria staff runs about $200 per day. the pizza den nearby will deliver whole pizzas for $9.00 each. the cafeteria staff cuts the pizza into eight slices and serves them in the usual cafeteria line. with no cooking duties, the staff can be reduced by half, for a fixed cost of $75 per day. should the school cafeteria make or buy its pizzas?

If the family’s net monthly income is 7,800 what percent of the income is spent on food clothing and housing?