Glaspar, that would be 1 oz of 70/30 with 4 oz of 100/0 not the other way around.
Mohave, you'll have 5 parts
a) 0% VG
b) 30%
c) 30%
d) 30%
e) 30%
Average = 120/5 or 24% VG (and 76% PG)
No graph but ChainVapor created a calculator that is in the stickies, and I worked out a table with different portions and that's in the FAQ.