176. 有个房子买卖叫single house sold last year, 其中有60% is existing house, 76% is new house were all sold, 而且有个条件是 3 times as new house as existing house are publish to the internet. (including sold -- 我的理解)问how many % is single house sold of the whole single house? 有这些答案60%, 64%, 72%, 78%, 70% (答案记不太清)