At the end of the accounting period Weaver, Inc. reports operating income of $50,000, a contribution margin of $15, and a fixed overhead rate of $6 per unit. Under variable costing, if this company produces 100 more units of inventory, then operating income:

a. will not be affected

b. will increase by $1,500

c. will decrease by $1,500

d. will increase by $900

e. will decrease by $900

f. will increase by $600

g. will decrease by $600

h. Cannot be determined