Analyzing Income under Absorption and Variable Costing

Variable manufacturing costs are $$115$ per unit, and fixed manufacturing costs are $$109,200.$ Sales are estimated to be $4,200$ units.

If an amount is zero, enter $"0".$ Round intermediate calculations to the nearest cent and your final answers to the nearest dollar.

a$.$ How much would absorption costing operating income differ between a plan to produce $4,200$ units and a plan to produce $5,200$ units?

$

b$.$ How much would variable costing operating income differ between the two production plans?

$