Hi, I have just worked out the Date & Rate and have documentation. Here goes- I have 2 kids born in June (2 yrs apart). one was born on the 3rd the other 27th, 24 days apart divide by 2 =12 add to 3rd == 15 June == RV date.
Their ages 34 & 37 = 3 numbers apart therefoe divide by 2 = 1.5 Add 1.5 to 34 or subtract from 37 = 35 divide by 10 == RV rate of 3.5.
RV date = June 15 2011
RV Rate = 3.5
IAM NOT A GURU
PS;The documentation I have is my kids Birth Certs!!!!