c$)$ Jamle had the following expenses over the past four years.

$\backslash$table$[[,$Nondlscretlonary Cost,Discretionary,Cost,Total Income$],[$Year $1,56,000,7000,,60,000],[$Year $2,54,000,8000,,60,000],[$Year $3,52,000,9000,,60,000],[$Year $4,50,000,10000,,60,000]]$

Calculate his Nondlscretlonary Cost percentage, his Discretlonary Cost percentage and his Total Operating Cost percentage. What would you advise Jamle regarding the changes in these percentages over tlme? $(10$ pts$)$