Explain simply why 21600 is the correct answer to: An Italian restaurant earns $600 every weekday and twice as much on the weekend. How much money does it earn by the end of the month?. Explanation:
On weekdays it earns $600 / weekday * 5 weekdays = $3000. During the weekend it earns twice as much each day so it makes ($600 * 2) / weekend day * 2 weekend days = $2400. Every week it earns $3000 + $2400 = $5400. By the end of the month, it earns $5400 / week * 4 weeks = $21600.