Bikes Manufacturing produces and sells childrens bikes at an average price of $125. Its costs are as follows: direct materials, $11; direct labour, $7; variable overhead, $3; sales commission, 4% of price. Its fixed monthly costs are $46,000.

Required:

1.	Using the above cost data, set up a monthly cost equation.
	Y=______+______x

2.	What is the companys contribution margin percentage? (Round your answer to 2 decimal places.)