Total cost Concept of Product Costing Willis Products Inc. uses the total cost concept of applying the cost-plus approach to product pricing. The costs of producing and selling 5,000 units of medical tablets are as follows: Willis Products desires a profit equal to a 25% rate of return on invested assets of $534,380. a. Determine the amount of desired profit from the production and sale of 5,000 units. $x b. Determine the total costs for the production of 5,000 units. \begin{tabular}{lc} Variable \& & x \\ Fixed & x \\ \cline { 2 - 2 } & \\ \hline Total & \end{tabular} Determine the cost amount per unit for the production and sale of 5,000 units. $ per unit c. Determine the total cost markup percentage per unit. (rounded to one decimal place). % d. Determine the selling price per unit. Round to the nearest cent. $ per unit