Mr. Hamm's salary has increased by 250% over the past 10 years. If his original salary was $28,000 per year, what is his current salary?

28000(1 + 250/100) = ______

To find Mr. Hamm's current salary, we need to calculate the increase in his salary over the past 10 years and add it to his original salary.

First, let's calculate the increase in his salary. Since his salary has increased by 250%, we can calculate the increase as follows:

Increase = (250/100) * Original Salary
Increase = (250/100) * $28,000

Using simple multiplication, we have:
Increase = 2.5 * $28,000
Increase = $70,000

Now, to find his current salary, we add the increase to his original salary:
Current Salary = Original Salary + Increase
Current Salary = $28,000 + $70,000
Current Salary = $98,000

Therefore, Mr. Hamm's current salary is $98,000 per year.