I would appreciate it if you solve the transactions by explaining and explaining in detail, thank you

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