M&D Chemicals Problem

M&D Chemicals is a fictional company supplying soap and detergent manufacturers. Pages 267-269 of Quantitative Methods for Business describe the following minimization problem.
1. Understand the problem.
2. State the objective.
4. Assign decision variables.
5. Write the objective function.
3. State the constraints.
6. Write the constraint inequalities.
7. Write the non-negativity constraints.