Q1.
Self employment income 52 S
Investment income is probably 52 S.
Salary from a company. If it's directors salary, it is collected under the PAYE system and is 1 class S for each week of employment. So it could be 52 S or less.
The total number of class S will be shown in the paid column. This could be 156 S in your case. The total reckonable paid column will show 52.
Q2.
Zero. There is no liability to pay class S in your 66th year from self employment or investment income. This is because the Prsi is collected under the self assessment system. You would need PAYE income in that year to gain the 26 contributions.
Directors salary or ARF drawdowns could get you 26 S or PAYE employment for 26 A.
Q3.
Use this how-to guide to find out how to calculate your State Pension (Contributory) rate using your Contribution Statement available on MyWelfare.
If you are qualifing using averaging calculation your Prsi contributions in your 66th year are not counted.