Problema Solution
The college bookstore sells a textbook that costs $80 for $94 and a textbook that costs $84 for $98.70. If the markup policy of the bookstore is linear, write a linear function that relates sales price S and cost C. What is the cost of a book that sells for $105.75?
Answer provided by our tutors
(80, 94) (84,98.7)
we get slope = 98.7-94 / 84-80 = 1.175
equation becomes S = 1.175C
so for a book selling for 105.75
C = S/1.175 = 105.75/1.175 = $90