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
[tex]400+550+3x \geq 2,300[/tex]
Solve for x
Combine like terms left side
[tex]950+3x \geq 2,300[/tex]
subtract 950 both sides
[tex]3x \geq 2,300-950[/tex]
[tex]3x \geq 1,350[/tex]
Divide by 3 both sides
[tex]x\geq \$450[/tex]
therefore
The minimum average interest she should earn in each of the next 3 years is $450
