People per Household

In the 2001 population census, information was collected about the number of people in each household, which is denoted by $X$ . It is given that $P(X=1) = 0.25$ , $P(X=2) = 0.32$ , $P(X=3) = 0.18$ , $P(X=4) = 0.15$ , $P(X=5) = 0.07$ , $P(X=6) = 0.02$ and $P(X\geq 7) = 0.01$ . If $R$ is the probability that there are at most $4$ people in the household, what is the value of $100R$ ?