Guthrie Industries manufactures and sells dog collars. The collars sell for $12 each. Information about the companys costs is as follows.

Variable manufacturing cost per unit $ 2 Variable selling and administrative cost per unit 1 Fixed manufacturing overhead per month $250,000 Fixed selling and administrative cost per month 200,000

Estimate the amount by which monthly operating income will increase if Guthrie anticipates a $60,000 increase in monthly sales volume.