Step-by-step explanation:
The journal entries are shown below:
On January 2013
Treasury stock Dr $200 million ($10 million shares × $20)
To Cash $200 million
(Being the purchase of stock is recorded)
On September 3, 2018
Cash Dr $21 million ($1 million shares × $21)
To Treasury stock $20 million ($1 million shares × $20)
To Paid in capital in share purchase $ 1 million
(Being the sale of treasury stock is recorded)
On November 4,2018
Cash $18 million ($1 million shares × $18)
Paid in capital in share purchase $1 million
Retained earnings $1 million
To Treasury stock $20 million ($1 million shares × $20)
(Being the sale of treasury stock is recorded)