Class Materials Charge - Stg sheet per gram and centigram

This is to sell sterling silver sheet or metal at a gram price or centigram price for students in our classes. 

A gram is $4.50. 

A centigram is $0.05

A centigram is 1 point of a gram: ie - 5.04 grams is 5 grams and 4 centigrams

5.64 grams is 5 grams and 64 centigrams.