Marketing estimates that a new instrument for the analysis of soil samples will be very successful, moderately successful, or unsuccessful with probabilities $0.3,0.6,$ and 0.1 , respectively. The yearly revenue associated with a very successful, moderately successful, or unsuccessful product is $\$ 10$ million, $\$ 5$ million, and $\$ 1$ million, respectively. Let the random variable $X$ denote the yearly revenue of the product. Determine the probability mass function of $X$.