Reemah,
accelerators are guidance that you can use to build your own solution. For a price calculation, you need to do following assemsent
1. How many user will be accessing
2. what is data storage needs
3. How many internal vs external users would be their
4. What all interfaces you need ( mobile or browser or both)
5. any integration needs, API integration with marketting module or sales or etc..
5. What analytics needs you have
etc..