Yohoho Products enters into a contract with a customer that involves two separate performance obligations: providing the customer with the YogaRight weight and the YogaCoach teaching software. YogaRight has a stand-alone selling price of $250. Yohoho sells both the YogaRight and the YogaCoach as a package deal for $300. The YogaCoach software does not have a standalone selling price. Yohoho is aware that other vendors charge $100 for similar software, and Yohoho's prices are generally 10% lower than what is charged by those vendors. Yohoho estimates that it incurs approximately $65 of cost per copy of the software, and usually charges 50% above cost on similar products. Using the residual approach, what would be the estimated stand-alone selling price of the YogaCoach software?

A. $50

B $80

C $90

D $8