The price is defined as the exchanged value for every product or service you offer. It is influenced by:
You are right: Finding the right price is a science of its own. Maybe even art. During your startup journey, you should constantly reevaluate and spend sufficient time on it.
Your business plan is neither science nor art. At the most, it is a small balancing act ;-). Your potential investor want to see that you have strategically thought about pricing and that you are aware of the balancing act. Show them how you approached pricing and why you chose this particular price for your offer:
The following three views are important for your calculation:
1. Cost-oriented strategy
Calculate how much money is needed to cover your costs. How much money do you need to make to keep from making a loss?
2. Competition-oriented strategy
Calculate the average price your competitors take.
3. Customer-oriented strategy
Calculate how much money your customer is willing/able to spend on your offer.
It is possible to get a different result for all three approaches. It can’t be helped. Nonetheless, all three sides should be taken into consideration. Decide on a focus and make a transparent decision.