Mark received a 20% raise on his $1,800 salary. What is his new salary?

To determine Mark's new salary after receiving a 20% raise, it is essential first to calculate the amount of the raise based on his original salary of $1,800.

To find the raise amount, you multiply the salary by the percentage increase, which is represented as a decimal. Thus, 20% as a decimal is 0.20. The calculation is as follows:

Raise = 1,800 * 0.20

Raise = 360

Next, you need to add the raise to the original salary to find the new salary:

New Salary = Original Salary + Raise

New Salary = 1,800 + 360

New Salary = 2,160

Therefore, Mark's new salary after applying the 20% raise is $2,160. This amount correctly reflects the total salary he will earn after the increase.