Question

A bicycle store costs $2,400 per month to operate. The store pays an average of $60 per bike. The average selling price of each bicycle is $120. How many bicycles must the store sell each month to break even?

Answer 1

If the store buys bikes for 60 and sells them at 120, they earn $60 per bike sold.
f(x)=60x-2400
0=60x-2400
2400=60x
x=40
They must sell 40 bikes.