If the regression method indicated the intercept = $30 and the slope = $20 for a cost function, then: Select one: the variable cost per unit of...

If the regression method indicated the intercept = $30 and the slope = $20 for a cost function, then:

Select one:

a. the variable cost per unit of activity is $30

b. estimated costs would be $320 at 10 units of activity

c. estimated costs would be $50 at 10 units of activity

d. estimated costs would be $230 at 10 units of activity