Suppose that the probability that LIBOR (London inter-bank offered rate) will increase next trimester is 0.025. Assume also that the probability that your company will open a new branch overseas is 0.20. If the probability that at least one of the two events occurs, i.e., LIBOR increases and/or your company opens a new overseas branch, is 0.21, what is the probability that both events occur? 

a) 0.225 

b) 0.015 

c) 0.010 

d) 0.007 

e) 0.005