In a sample space with 4 simple events, E1, E2, E3, and E4, with the probabilities P(E1)=P(E2)=0.3, P(E3)=0.1. Define event A={E1, E3, E4}. Find P(A).
a) 0.7
b) 0.4
c) 0.6
d) 0.5