Marla is planning the lunch menu for an elementary school. There are 5 third grade classes with 30 students each, 4 fourth grade classes with 28 students each, and 4 fifth grade classes with 27 students each. Each student gets a hamburger, which costs $2.10, some carrots, which cost $0.50, and a cookie, which cost $0.20. How much does one lunch for all the students cost? Let's answer step by step:
First find the total number of students in third grade 5 classes * 30 students / class = 150 students. Then find the total number of students in fourth grade 4 classes * 28 students / class = 112 students. Then find the total number of student in fifth grade 4 classes * 27 students / class = 108 students. Now add the number of students in each grade to find the total number of students 150 students + 112 students + 108 students = 370 students. Now find the total cost of one lunch $2.10 + $0.50 + $0.20 = $2.80. Now multiply that cost by the number of students to find the total cost for the school $2.80 / student * 370 students = $1036. The answer: 1036.