please explain how to work this question

Green Valley Nursing Home Inc. Statement of Income Year Ended December 31, 2012 $3,163,258 106,146 $3,269,404 Revenue: Resident services revenue Other revenue Total revenues Expenses: Salaries and benefits Medical supplies and drugs Insurance and other Provision for bad debts Depreciation Interest Total expenses Operating income Provision for income taxes Net income $1,515,438 966,781 296,357 110,000 85,000 206,780 $3,180,356 $ 89,048 31,167 $ 57,881 a. How does this income statement differ from the ones presented in Exhibit 11.1 and Problem 11.2? b. Why does Green Valley show a provision for income taxes while the other two income statements do not? c. What is Green Valley's total (profit) margin? How does this value compare with the values for Park Ridge Homecare Clinic and BestCare HMO? d. The before-tax profit margin for Green Valley is operating income divided by total revenues. Calculate Green Valley's before-tax profit margin. Why may this Why may this be a better measure of expense control when comparing an investor-owned business with a not-for-profit business