Maryland Public Schools requires all high school students to complete 75 hours of volunteer service as a condition for graduation. One school...

Maryland Public Schools requires all high school students to complete 75 hours of volunteer service as a condition for graduation. One school includes grades 1-12, with 50 students in each grade. The school decides that students in grade g will volunteer 0.25 g hours per week of their time. How many hours will all the school's students collectively donate to charity each week?