Rocky had same expenses in 2003 and 2002 on bike and car travel taken together. If he incurred 50% of his travel expenses of 2003 on bus travel, what was the increase in expenses on bus travel in 2003 when compared to 2002?
b. 50%
Combined expenses on bike and car in 2002 = .6, remains same in 2003. Bus forms 50% of his expenses in 2003. Thus bus expenses in 2003=combined expense on bike and car in 2003 = .6; also bus expense in 2002=.4 => % increase: (.6-.4)/.4 * 100 = 50%
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