When a business calculates TAXABLE INCOME from gross income, which of the following is true? The business has obtained and is paying off a business loan. (a) Depreciation, interest and principal are all subtracted (b) Depreciation is subtracted; interest and principal are not. (c) Depreciation and interest are subtracted; principal is not (d)Interest and principal are subtracted, depreciation is not. (Unrelated to above) If the inflation rates averages 6% per year and your return on an investment based on then-current dollars (that is by definition, the combined inflation and real) is 11%, what is your real return on investment