Some costs vary by volume or usage. Example: AWS costs or manufacturing costs. Also sometimes you set your prices by the company size, or the number of employees.
Please watch our Youtube video for a detailed walk-through explaining how to calculate such costs (which can be applied to prices too) as well as how to formulate assumptions.
Want to learn more? Sign up for our FREE MASTERCLASS "Build Credible Financials for Your Early-Stage Venture" to learn our unique framework for modeling early-stage ventures applicable to any product, software, and service startup!