Answer and Explanation :
As per the data given in the question,
Before passing the journal entries we need to do the following calculations which are shown below
Total compensation expense = Options granted × Fair value per option
= 15 million × $4 per options
= $60 million
Compensation expense to be recognized each year = $60 million ÷ 3 years
= $20 million
Now
Journal Entries are as follows
On Dec-31,2021
Compensation expense A/c Dr. $20 million
To Paid in capital stock options Cr. $20 million
(Being the compensation expense is recorded )
On Dec-31,2022
Compensation expense A/c Dr. $20 million
To Paid in capital stock options Cr. $20 million
(Being the compensation expense is recorded )
On Apr-3,2024
Cash A/c Dr. $480 million (15 million × $32)
Paid in capital stock options A/c Dr. $60 million
To Common stock Cr. $15 million
To Paid in capital in excess of par Cr. $525 million
(Being the exercise of options is recorded)