The total number of marbles in the bowl is 120.
The number of red marbles in the bowl is 120 (total) - 80 (black) - 28 (white) = 12.
Therefore, the probability that Nicole will pull a red marble out of the bowl is:
Number of red marbles / Total number of marbles = 12 / 120 = 1/10 = 0.1 = 10%.
So, the probability is 10%.