Hi, can someone help me out with "C"? Thank you

Assume personal income was $30 million last year. Personal outlays were $10 million and personal current taxes were $7 million. Your answer is correct. What was the amount of disposable personal income last year? Disposable personal income (DPI) (b) Your answer is correct. What was the amount of personal saving last year? Personal savings (PS) (c) X Your answer is incorrect. Calculate personal saving as a percentage of disposable personal income. (Round answer to 1 decimal places, e.g. 527.5.) Savings rate %