Baby Afghan Update and cost calculation

After battling pneumonia for a little over a week finally picked my hooks up a couple of days ago.  Got approximately half of my yarn used for the baby afghan so started decreasing.  Wanted to be sure I had enough to finish and put an edging on it.  Yarn Chicken not an option!!!!!


Am real happy with the diagonal block (C2C) pattern for this project.  Gives some texture and the yarn colors flow nicely.  Picture doesn't do it justice, however.

Will be allocating my crochet time between this and 2 other projects for the next few days or so.

As I mentioned before was working on a cost calculation to share.  Lost it a couple of times -- didn't save!  But have the shell done.  Image below is the basic shell, will be expanding with appropriate labeling and calculations.  

Some items I don't see mentioned in cost discussion, sales tax and mileage (special trip/across town as part of another trip) miles and IRS 2019 mileage reimbursement rate. For this I just made up a sales tax rate (I don't have it in Oregon) and used roundtrip miles special trip to get yarn for that calculation.  Yarn stats made up for this purpose also.

Snapshot of the shell:  As you can see sales tax and mileage add about 2 cents per yard to the cost.  Mileage is significant at 58 cents per mile, as you can see if I make a special trip to town to get 4 skeins of yarn at 5 dollars each (20 total), mileage is $23.20 and this would be the cost whether I purchased one skein or 100 skeins, doing this for 1 skein would raise the cost for the skein from 5 dollars to 28.20 (not including tax) but purchasing 4 skeins the cost per skein would be 5.80 for a total of 10.80 per skein  (not including tax). Hope to have a spreadsheet available to share within the next few weeks.