a. Wilson filed his individual tax return on the original due date, but failed to pay $10,720 in taxes that were due with the return. If Wilson pays the taxes exactly 15 months late, calculate the amount of his failure-to-pay penalty. $

b. Joan filed her individual income tax return 7 months after it was due. She did not request an extension of time for filing. Along with her return, Joan remitted a check for $11,960, which was the balance of the taxes she owed with her return. Disregarding interest, calculate the total penalties that Joan will be required to pay, assuming the failure to file was not fraudulent. $

c. Jack filed his tax return 6 months and 1 days late and did not request an extension of time for filing. Jack's return indicated that he is to receive a $10,045 refund in taxes. Calculate the amount of Jack's penalty for failure to file his tax return on time, assuming the failure-to-file was not fraudulent. $