I am helping several of my co-workers study for the ABO, and we came across this question that I cannot figure out. Here it is:

A lens is surfaced with 3 prism diopters base up and in at 45 degrees combined with 4 prism diopters base up and out at 95 degrees. What is the amount and direction of the resulting prism?
a. 6.5 base up and in at 74 degrees
b. 5.5 base up and in at 54 degrees
c. 4.5 base up and out at 74 degrees
d. 6.5 base up and out at 74 degrees

This one has really stumped us all, and I know it is probably not a vital question to passing the exam (I did and I have no clue about this one!) but now I just have to know! Thanks!