It does. 0.9r is a representation of 1: And it is a logical one because it cannot be more or less than 1, so it's 1. Because there can be no gap between it and 1, and if there is no gap then it must be the same number, represented in decimal.
And so since 0.3 X 3 = 0.9, and 0.3r X 3=0.9r, then 0.3r X 3 =1 because 1=0.9r
EvF
And so since 0.3 X 3 = 0.9, and 0.3r X 3=0.9r, then 0.3r X 3 =1 because 1=0.9r
EvF