The local skating rink pays Mary a fixed rate per pupil plus a base amount to work as a skating instructor. She earns $90 for instructing 15 students on Monday afternoon. Last Friday, she earned $62 for working with 8 students. Lisa is also a skating instructor. She receives half the base amount that Mary does, but she is paid twice as much per student. Who would earn more money instructing a class of 20 students?
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Answer:
lisa
Step-by-step explanation:
let say mary base price = x
mary per student price = y
x+15y = 90
x+8y = 62
7y = 28
y =4
x = 30
mary will earn for 20 students = 30 + 20*4 = 110
lisa base money = 30/2= 15
lisa per student = 4*2=8
lisa earning for 20 students
= 15 + 20*8 = 175
lisa will earn more money
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