I tried a 100 and it was wrong too. please tell me the right answer, it's my last attempt. Thank you!

Rita forgot to pay her Federal income tax on time. When she actually filed, she reported a balance due. Compute Rita's failure to file penalty in each of the following cases. Ignore the failure to pay penalty in your computations. Penalty a. Two months late, $1,000 additional tax due. $ 215 X b. Five months late, $3,000 additional tax due. $ 750 C. Eight months late, $4,000 additional tax due. $ 1,000 d. Two and a half months late, $3,000 additional tax due. $ 450 e. Five months late due to fraud by Rita, $4,000 additional tax due. $ 3,000 f. Ten months late due to fraud by Rita, $15,000 additional tax due. $ 11,250