Answer:
[tex]S=42000*\sum_{i=0}^{n}0.02^n[/tex]
Step-by-step explanation:
The salary per year is the combination of the $42000 per year (constant) plus the 2% rise per year. So the ecuation is:
Firt year [tex]S=(42000 + 0.02*42000)[/tex]
Second year [tex]S=(42000 + 0.02*42000)+0.02*(42000 + 0.2*42000)[/tex]
Generalizing:
[tex]S=42000*\sum_{i=0}^{n}0.02^n[/tex]