Question

an employee,who received fixed annul increments,had a final salary of sh 9000 after 10 years.if his total salary was sh 65000 over the 10 years,what was his initial salary?

Answer 1

This is just an arithmetic sequence, with (in thousands)
a = ?
T10 = 9
S10 = 65

10/2 (a+9) = 65
a = 4

So, the initial salary was 4000.