$12$: Inventory Management

$\backslash$table$[[$Table cloths,$32,5],[$Fish filets,$143,10],[$Prime rib roasts,$166,6],[$Oil$,28,2],[$Lettuce $($case$),35,24],[$Chickens$,75,14],[$Order pads,$12,2],[$Eggs $($case$),22,7],[$Bacon$,56,5],[$Sugar$,4,2]]$

a$.$ Which is the most expensive item, using annual dollar volume?

b$.$ Which are C items?

c$.$ What is the annual dollar volume for all $20$ items? $[$PX$]$

$12\mathrm{.}3$ Jean$-$Marie Bourjolly's restaurant has the following inventory items that it orders on a weekly basis:

$\backslash$table$[[$INVENTORY ITEM,$ VALUE$/$CASE$,$# ORDERED$/$WEEK$],[$Rib eye steak,$13$ A$,3],[$Lobster tail,$245,3],[$Pasta$,23,12],[$Salt$,3,2],[$Napkins$,12,2],[$Tomato sauce,$23,11],[$French fries,$43,32],[$Pepper$,3,3],[$Garlic powder,$11,3],[$Trash can liners,$12,3]]$