Please only answer my whole question parts a), b) & c) ON EXCEL AND POST SCREENSHOTS PLZZZ, thank you . Please only answer if you have access to a personal computer. Plz provide equations and explanations. Please I will give a thumbs up for your efforts so plz don't copy and paste from any online sources.

When Vidalia onions are ready, the entire 13 county (plus parts of seven other counties) area in Georgia where they are grown is devoted to the harvest, packaging and shipping of this delicacy. The Onion Shack currently purchases 120,000 bags of onions each year at a price of $100 per bag (a bag is ten pounds). Onion Shack has historically purchased in lots of 3000 bags. Transit time and capacity vary as indicated in the table. The safety inventory that Onion Shack requires is 30% of lead time demand and the holding cost for a bag is 15% of the cost.

Carrier	Quantity Shipped (cwt)	Quantity shipped (bags)	Shipping cost ($/cwt)	Transit time (days)
Mashburn Rail	200+	2000+	$2.10	5
Sylvia Express	100+	1000+	$2.35	3
Anita Enterprises	250+	2500+	$1.35	3
Smith Trucking	250+	2500+	$1.00	3

1. determine the least expensive transportation option if the Onion Shack continues to purchase 120,000 bags of Vidalia onions each year.
2. determine the least expensive transportation option if the Onion Shack purchases 240,000 bags of Vidalia onions each year.
3. determine the least expensive transportation option if the Onion Shack purchases 480,000 bags of Vidalia onions each year.