Hi there, I am currently working on Q5 (constructing a tangency portfolio) in the excel spreadsheet linked below. Could you please assist me in checking if the formulas and values are correct? Also, I am not sure my sharpe ratio is correct, how can this be fixed? Any assistance is greatly appreciated. Thanks, Chris.

https://docs.google.com/spreadsheets/d/1dls-VCguIpVCaA4gw6QXH4pOiCnA4kxzrOm1m8IWPPg/edit?usp=sharing