A question on my homework says "Ended the year with an inventory balance of $100. (Hint: You must back out the supplies expense) The supplies expense (a question asked before this one) stated "ordered and received $2400 worth of supplies and sent the supplier a check for $1800. These questions are part of a transactions worksheet I'm creating.

You need to take your beginning inventory balance + purchases made during the year - ending balance to get the inventory that was used during the year. This is your Supplies Expense for the year.