Jake charges $25 to cut a half an acre of grass. He charges $10 for each additional half an acre. The Robertsons paid him $55 to cut their grass. How large is the Robertsons' yard?

(July 2005) Gasoline prices are skyrocketing again! Last year, at this time, a gallon of gasoline cost $1.45. If the current price per gallon is $2.15, how much has the price of gasoline increased over the past year? (answer as 0.00)

Ramona sells homemade cookies. You can buy singles for $0.50, half a dozen for $2.50 or a dozen for $4.00. What is the discount for buying a dozen (12)?

Ramona sells homemade cookies. You can buy singles for $0.50, half a dozen for $2.50 or a dozen for $4.00. Yesterday she sold 2 dozens, 3 half dozens and 5 singles. How much money did she take in (gross income)?

When a video game first hits the store shelves the price is $49.95 (call it $50). After 6 months the retailer will discount the price to $24.95 (call it $25). What is the amount of the price decrease after six months?

Cindy charges $2 an hour to baby-sit up to three children. For 4 or more she charges an extra seventy-five cents per hour for each child. The Hansons needed her to sit for their 5 children for 5 hours last weekend. How much should she have been paid?