Answer:
The minimum average interest she should earn in each of the next 3 years is $450
Step-by-step explanation:
Let
x -----> the average interest she should earn in each of the next 3 years
we know that
The sum of the amount earned over the 5-year period must be greater than or equal to $2,300
The inequality that represent this situation is
\(400+550+3x \geq 2,300\)
Solve for x
Combine like terms left side
\(950+3x \geq 2,300\)
subtract 950 both sides
\(3x \geq 2,300-950\)
\(3x \geq 1,350\)
Divide by 3 both sides
\(x\geq \$450\)
therefore
The minimum average interest she should earn in each of the next 3 years is $450
