$67247.39
Explanation
Step 1
find the average of the 3 highest years salaries
Let
[tex]\begin{gathered} \text{salary}_1=88000 \\ \text{salary}_2=91000 \\ \text{salary}_3=92250 \end{gathered}[/tex]
hence
[tex]\begin{gathered} \text{salary average=}\frac{salary_1+salary_2+salary_3}{3} \\ \text{salary average=}\frac{88000+91000+92250}{3} \\ \text{salary average=}\frac{271250}{3} \\ \text{salary average=90416.67} \end{gathered}[/tex]
Step 2
find the 2.125 % of salary average
[tex]2.125\text{ \% = }\frac{\text{2.125}}{100}=0.02125[/tex]
so, to find the 2.125 % of any number, multiply the number by 0.02125
Hence
[tex]21.25\text{ \% of 90416.67=0.019212125}\cdot90416.67=1921.35[/tex]
Step 3
find the pension
pension that is calculated by multiplying the number of years worked times 2.125% of the average of the 3 highest year's salaries.
Let
years John worked=35
replace
[tex]\begin{gathered} \text{Pension}=35\cdot1921.35 \\ \text{Pension}=67247 \end{gathered}[/tex]
I hope this helps you