Answer:
It will take 12 years for LaShelle to recover her financial investment in her master's degree.
Explanation:
Given:
Tuition cost of Master's Degree =

Number of years to complete Master's Degree = 3 years.
To calculate Total cost of Master's Degree we will multiply Tuition cost of Master's Degree per year with Number of years to complete Master's Degree.
Total Cost on Master Degree = Tuition cost of Master's Degree per year
Number of years to complete Master's Degree =

Now after having Master's degree she will earn

To calculate Number of years required to recover her financial investment in her master's degree we will divide Total Cost on Master Degree with earning after having Master's degree
Number of years required =

Hence it will take 12 years for LaShelle to recover her financial investment in her master's degree.