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please help and show work, high light answers please! thank you

? Sage Company is operating at 90% of capacity and is currently purchasing a part used in its manufacturing operations for $17.00 per unit. The unit cost for the business to make the part is $22.00, including fixed costs, and $9.00, not including fixed costs. If 31,902 units of the part are normally purchased during the year but could be manufactured using unused capacity, the amount of differential cost increase or decrease from making the part rather than purchasing it would be a Oa. $542,334 cost decrease Ob. $159,510 cost increase Oc. $255,216 cost decrease Od. $255,216 cost increase Yasmin Co. can further process Product B to produce Product C. Product B is currently selling for $33 per pound and costs $27 per pound to produce. Product C would sell for $57 per pound and would require an additional cost of $24 per pound to produce. The differential cost of producing Product C is Oa. $24 per pound Ob. $27 per pound Oc. $33 per pound Od. $57 per pound Jacoby Company received an offer from an exporter for 22,600 units of product at $18 per unit. The acceptance of the offer will not affect normal production or domestic sales prices. The following data are available: $24 Domestic unit sales price Unit manufacturing costs: Variable 9 Fixed 5 The differential revenue from the acceptance of the offer is Oa. $406,800 Ob. $542,400 Oc. $949,200 Od. $135,600 Mallard Corporation uses the product cost method of product pricing. Below is cost information for the production and sale of 45,000 units of its sole product. Mallard desires a profit equal to a 12% return on invested assets of $800,000. Fixed factory overhead cost $82,000 45,000 Fixed selling and administrative costs Variable direct materials cost per unit 5.50 Variable direct labor cost per unit 7.65 Variable factory overhead cost per unit 2.25 Variable selling and administrative cost per unit 0.90 The markup percentage on product cost for the company's product is Oa. 26.1% Ob. 10.9% Oc. 18.0% O d. 23.4%