A local high school is organizing an art competition for its students. The students in the top-five will be awarded cash prizes. The student in the first place will get the high test amount, and each student after will $80 less then the prize given to the first student, which function models the total amount of cash needed for the top five students ? a) A(m) = 5m - 800
b) A(m) = 5m - 320
c) A(m) = m - 800
d) A(m) = m - 320