Merit a percentage (4)
I believe the answer is:
rate
I believe this is a double definition.
'merit' is the first definition.
(I've seen this before)
'a percentage' is the second definition.
(I've seen this before)
(Other definitions for rate that I've seen before include "Fixed price or relative speed" , "See 11" , "Judge" , "Deserve; scold" , "Think highly of - price" .)