Seems like a standard pricing question. Answers could focus on:
- Value to the consumer (most likely the right / relevant answer since it will allow for price differentiation between various categories of consumers)
- Cost+ model, how much it cost to develop + some margin
PS: Other considerations include psychological impact of various price points, as well as one-off upfront fee vs. a monthly charge vs. "free installation, pay for the upgrade" -> cf. gaming industry.
Hope this helps