RSE Corporation sells its product for $11 per unit. Its variable cost is $2 per unit, and total fixed costs are $600. Assuming next periods estimated sales are 240 units and that 240 units is within the relevant range, calculate the following amounts:

a. Degree of operating leverage

b. Margin of safety in units

c. Margin of safety in revenues (in $) ]

d. Estimated income or loss (indicate which)