Problem 11-51 (LO 11-2) Determine the maximum contribution that can be made to a Keogh plan in each of the following cases. In all instances, the individuals self-employed, and the self-employment tax reduction has already been taken. a Self-employment income of $61,000 b. Self-employment income of $61,000 and wage income of $37500 c Self-employment income of $180,000 d. Self-employment income of $305,000 a. Maximum Keogh plan contribution b. Maximum Keogh plan contribution Maximum Keogh plan contribution d. Maximum Keogh plan contribution