PLEASE USE SOLVER AND PROVIDE STEP BY STEP INSTRUCTIONS $1.$ A company services three customers. It has two warehouses with $40$ units and $30$ units available at warehouses $1$ and $2,$ respectively. Each customer requires $30$ units. A unit penalty cost of $$90,$ $$80$ and $$110$ for customers $1,2$ and $3,$ respectively is charged for unsatisfied demand. The table below shows the unit shipping cost from each warehouse to each customer. How can the company minimize its total cost?

From$/$To Customer $1$ Customer $2$ Customer $3$

Warehouse $1$ $$15$ $$35$ $$25$

Warehouse $2$ $$10$ $$30$ $$40$