On January 1, 2020, Kenya Company granted 100 share options each to 500 employees, conditional upon the employee's remaining in the entity's employ during the vesting period. 

The share options vesting period is at the end of year 3. 

The fair value of each share option at the date of the grant is 30.  

The Par value of each share is 100 & the option price is 120. 

On December 31, 2021, 30 employees left and it is expected that based on a weighted average probability, a further 30 employees will leave before the end of the three years. On December 31, 2022, there are 20 employees left and all of the share options are exercised on such date. 

Required:

1) How much is the salary expense in 2020?

2) How much is the salary expense in 2021?

3) How much is the salary expense in 2022?

4) How much is the share premium credited in 2022 for the issuance of shares? 

5) How much is the salary expense in 2020? 

6) What are the related journal entry?