Kando company incurs a $9 per unit cost for product a, which it currently manufactures and sells for $13.50 per unit. instead of manufacturing and selling this product, the company can purchase it for $5 per unit and sell it for $12 per unit. if it does so, unit sales would remain unchanged and $5 of the $9 per unit costs of product a would be eliminated. 1. prepare incremental cost analysis. should the company continue to manufacture product a or purchase it for resale?