Jamie had the following expenses over the past four years.

Nondiscretionary cost Discretionary cost Total income

Year $156,0007,00060,000$

Year $254,0008,00060,000$

Year $352,0009,00060,000$

Year $450,00010,00060,000$

Calculate his Nondiscretionary Cost percentage, his Discretionary Cost percentage and his Total Operating Cost percentage. What would you advise Jamie regarding the changes in these percentages over time? $(10$ pts$)$