Hyeonwoo's income is 20% less than Yoonsuh's income, Woojin's income is 40% less than Hyeonwoo's income, and Hyeonjoon's income is 20% less than Hyeonwoo's income. If Yoonsuh gave 40% of his income to Woojin and 60% of his income to Hyeonjoon, Woojin's new income would be what fraction of Hyeonjoon's new income?
Two walls of a an Indoor Stadium have to be painted. The first wall is of length 17 meters and height 8 meters. The cost of the paint for this wall is ₩20 per square meter. The second wall is of length 17 meters and height 9 meters. The cost of the paint for this wall is ₩30 per square meters. The ratio of the costs of painting the first wall to the second one is: