Does this inequality have a solution?

Not exactly homework, but I don't know who else to ask about my rusty math skills...

Anyway given the following:

R = A/(A+B) and the inequality B/A < 0.2

What is the minimum value of R that satisfies the inequality?

Does this have a solution or do I need to go looking for more information?

Thanks in advance!

R = A/(A+B)
(A+B)/A = 1/R
1+(B/A) = 1/R
B/A = (1/R)-1
0.2 > B/A = (1/R)-1 < 0.2
1/R < 1.2 = 6/5
R > 5/6

Thus, the lowest value of (R > 5/6) is slightly above 5/6=0.8333...