Explain simply why 720 is the correct answer to: Carrie works for $8 an hour and 35 hours a week at her job. It’s been a month since she started working there. She has saved up all of her money because she wants to buy a bike for $400. How much money will she have left over after she buys her bike?. Explanation:
It will be easy to solve the problem by first calculating how much money she makes in a week at her job by multiplying her hourly rate by the number of hours she works in a week: $8 * 35 = $280 in a week. The weekly earnings need to be multiplied by the number of weeks in a month to get how much she made in a month: $280 * 4 = $1120. The bike’s cost must be subtracted from her earnings made in a month to get how much money is left over after purchasing the bike: $1120 - $400 = $720 is left over after purchasing her bike.