We have the following information
1 bag
50 white chips
27 black chips
we are ask to find
the probability of drawing two black chips
first we find the total amount of chips
50+27=77
then the probability of drawing ONE black chip is given by
p1=27/77
since we are introducing again the chip in the bag the probability to drawing a second black chip is given by
p2=27/77
then the total probability is
P=p1*p2
then the probability is
A) 0.123