Rafter Table for 4/12 Slope

Rafter Table for 4/12 Slope
Length of Common Rafters Per Foot of Run
12) 65"
Length of Hip or Valley Rafters Per Foot of Run
17) 44"
Difference in Length of Jacks @ 16" on Centers
16 7/8"
Difference in Length of Jacks @ 24" on Centers
25 5/16"
Find the length of the tails of the jack rafters in the accompanying figure.

A) 8"
B) 8 3/16"
C) 8 7/16"
D) 8 3/4"