Answer: Sales commissions, promotional budget, and product development costs
Step-by-step explanation:
Hi, the variable costs are Sales commissions, promotional budget, and product development costs, because they depend on the number of sales, or the production. These costs will increase or decrease depending on the sales and production volume.
Office rent and office sales are invariable costs, it doesn’t matter the amount of sales or the production, they don't increase of decrease because of it. They remain the same (fixed costs).
Feel free to ask for more if needed or if you did not understand something.