Let 'x' be the total number of cases the legal firm completed.
number of pro bono cases = 2% of x
as per the question,
given number of pro bono cases = 252
this means,
2 % of x = 252
(2รท100) * x = 252
on solving we get
x = 12600
so, the total number of cases legal firm accepted = 126, 00