Sam earns $42,900 per year.
And you are asked to find how much he earns every two weeks (which is normally how most workers get paid)
So, we need to recall that there are a total of 52 weeks in a full year.
Then using this, we can find how much he earns per week, simply by dividing $42,900 by 52:
When you do the division, you get 825, which means that every week he earns $825.
Recall now that you are asked what his bi-weekly salary is. That is the salary every two weeks. So we just need to multiply the $825 times two in order to get the final answer:
Sam's biweekly salary is: $1,650