The mass transit district of Boston has won a grant of $50 million from the US Department of Transportation to improve its system. The CEO of the Boston MTD must decide where to invest the grant money in the train system, in the bus network, or in improving the sidewalks. She has the following information about the commuters: 10% of use all three transport modes: they use the train, the bus and also walk. A total of 50% of the commuters use the bus. Out of the commuters that use the bus, 20% also use the train and walk, 40% also walk but don't take the train, and 40% also walk but don't use the train. 20% just use the bus 20% just walk 10% use the train and walk but don't use the bus [Hint: Each problem below only asks about two modes of transportation. For each problem you should create a chart with only those two modes of transportation to calculate the answers. Be sure to include all the relevant data above in creating your charts.] 1. Walking and taking the train are: 2. What proportion of commuters took the train and walk