4. If you had to decide whether to continue making a component part or to begin buying the part from an overseas supplier, what quantitative and qualitative factors would influence your decision?$3,000 $2,500 $2,000 $1,500 Shipping Expense $1,000 $500 $0 0 2 4 6 8 10 Units Shipped 3. This question is regarding high-low method, where the scatter graph above indicates that an approximately linear relationship exists between the number of units shipped and the total shipping expense. Required: a) Using the high-low estimates, prepare the related cost formula