Approximately $14,400. Explanation: it's asking to round up to the nearest hundred so it is $400 a month for 3 years. you multiply the $400 dollars by 12 and you get $4,800 which is how much it cost for 1 year then multiply that by 3 to get the amount of the 3 years of payment and that equals $14,400
Based on the given information, it is $15.6. However, it never specified how many hours she works a day and how many days of the week she works, so we must assume it is just 624/40.