Problem 3-40 (LO 3-3) Required: A married couple received $9,000 of social security benefits. a. Calculate the taxable amount of those benefits if the couple's provisional income is $20,000. b. Calculate the taxable amount of those benefits if the couple's provisional income is $37,500. c. Calculate the taxable amount of those benefits if the couple's provisional income is $55,000. a. b. C. Taxable amount of benefits