  We obtain entropy formulas for SRB measures with finite entropy given by
inducing schemes. In the first part of the work, we obtain Pesin entropy
formula for the class of noninvertible systems whose SRB measures are given by
Gibbs-Markov induced maps. In the second part, we obtain Pesin entropy formula
for invertible maps whose SRB measures given by Young sets, taking into account
a classical compression technique along the stable direction that allows a
reduction of the return map associated with a Young set to a Gibbs-Markov map.
In both cases, we give applications of our main results to several classes of
dynamical systems with singular sets, where the classical results by Ruelle and
Pesin cannot be applied. We also present examples of systems with SRB measures
given by inducing schemes for which Ruelle inequality does not hold.
