Personal income amounted to $17 million last year. Personal current taxes amounted to $4 million and personal

Question:

Personal income amounted to $17 million last year. Personal current taxes amounted to $4 million and personal outlays for consumption expenditures, non-mortgage interest, and so forth were $12 million.
a. What was the amount of disposable personal income last year?
b. What was the amount of personal saving last year?
c. Calculate personal saving as a percentage of disposable personal income.