Let R be the reaction of the body to some stimulus of strength s (measured in the appropriate units). The sensitivity S is defined to be the rate of change of the reaction with repect to s. Suppose that, for the particular R and s, the following experimental formula has been used:
R=（20+28s^0.9）/(1+9s^0.9)
The sensitivity S at equals _____ (units of )/(units of )
how can I find the unit of the sensitivity
I get s=64.08 but I don't know how to defined the unit