50 points
Katy wants to invest early in her life. She decides to save some amount every month to invest in shares. To save a specific amount every month, Katy must create a personal budget. How can Katy determine if she has surplus to invest in shares?
A. Calculate total expenses and then subtract the average income derived from all sources.
B. Calculate total income derived from one regular source and then add the average expense to it.
C. Calculate total income derived from one regular source and then subtract all expenses from it.
D. Calculate total income derived from all sources and then subtract the average expense from it.
E. Calculate total expense and then divide the average income derived from all the sources.