1. High-Low Method. You are requested to help in the preparation of fixed budgets. The study made of the shipping expenses showed the following over a period of time, and there is no indication that past trends will change in the future:

Sales Volume 10,300

11,700 13,500 27,500

9,300

9,700 14,000 15,000 10,000 10,500

Shipping Expense P3,090

3,100 3,330 5,850 2,889 2,910 4,170 4,200 2,900 3,225