please show step by step in solver

A firm has 4 plants that produce widgets. Plants A, B, and C can each produce 100 widgets per day. Plant D can produce 50 widgets per day. Each day, the widgets produced in the plants must be shipped to satisfy the demand of 3 customers. Customer 1 requires 75 units per day, customer 2 requires 100 units per day, and customer 3 requires 175 units per day. The shipping costs for each possible route are shown in the table below: Shipping Costs Customer per unit Plant 1 2 3 A $25 $35 $15 B $20 $30 $40 C $40 $35 $20 D $15 $20 $25 The firm needs to satisfy all demand each day, but would like to minimize the total costs. What is the minimum daily shipping cost that the firm can achieve