Roye Kennel uses tenant-days as its measure of activity; an animal housed in the kennel for one day is counted as one tenant-day. During September, the kennel budgeted for 3,300 tenant-days, but its actual level of activity was 3,330 tenant-days. The kennel has provided the following data concerning the formulas used in its budgeting and its actual results for September:
Data used in budgeting:
Actual results for September: 
-The overall revenue and spending variance (i.e. ,the variance for net operating income in the revenue and spending variance column on the flexible budget performance report) for September would be closest to:
Definitions:
Marginal Product
The additional output resulting from the use of one more unit of a production input.
Total Product
The total output of goods or services produced by a firm over a given period of time.
Marginal Product
Marginal product is the additional output gained from increasing one unit of a variable input, holding all other inputs constant, in the production process.
Total Product
The total quantity of output that a firm produces with a given amount of fixed and variable inputs during a specified period.
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