A friend tells you that you should buy AST Company stock as it is a "great deal." It is January 1, 2020 and the stock is trading at $25 per share. You obtain the financial statements for Leclerc and determine the following: 

- Book value is $12 per share as of December 31, 2019. 

- Earnings for 2019 were $4.0 per share. 

- Earnings are expected to grow at 20% for the next four years. 

- Dividend payout is 40%.

 - Residual income is expected to be zero from 2021 onwards. 

- Cost of equity capital is 15%. 

Determine, using the residual income method, whether you should buy AST stock as of January 1, 2020.