not kidding, i have listed my assumption.. you can count for yourself.
the annual increment for avg performer can be quite miserable. people stay is because of stability and bonus (around avg 4 mths spread across the year)

anyway 8k in PS easily translate into more than 130k p.a. (avg >10k per mth) say you start work at 24/25.. you will reach 130p.a at the age of 42. not too bad for a avg performer, you cant get this sum if you are a avg performer in private sector

note : i didnt factor in any pay revision due to inflation