Your manager thinks that the lab saves money by making its own stock solutions of protease inhibitors. But, you think you might save money by buying pre-packaged protease inhibitor tablets. Find out which is the least expensive. How much each strategy would cost yearly, for a lab that breaks 100 mL of cells per week

Making it on your own

Protease type	Specific inhibitor	Working concentration	Cost
Serine	PMSF (MW: 174) Aprotinin	1 mM 10 µg/mL	$50/ 250 mg $650/ 100 mg
Cys & Ser	Leupeptin	10 µg/mL	$796/ 50 mg
Cysteine	E-64 (MW: 357)	1 mM	$474 / 25 mg
Aspartic Acid	Pepstatin	2 µg/mL	$718/ 100 mg
Metallo-	EDTA (MW 292)	1 mM	$29/ 100 g

Pre made

ThermoFisher sells Pre-made Protease inhibitor with all the above proteases for $749 for 10mL of 100X solution

Based on the yearly calculations from the "pre-made" and "on your own" strategy which one is least expensive and by how much.