A certain forest covers an area of 4000 km2. Suppose that each year this area decreases by 7%. What will the area be after 5 years?

2,600

Explanation:

Your first step is to find 7% of 4000 (this is what it is decreasing by per year).

As a result you end up with 280.

Multiply 280 by 5.

1,400 should be your answer (amount of km decreasing after 5 years). This is a decreasing forest, so you subtract 4,000by 1,400.