商場銷售一批襯衫,平均每天可售出20件,每件盈利40元,為了擴大銷售,增加盈利,盡快減少庫存,商場決定降價,調(diào)查發(fā)現(xiàn),如果每件降價1元,商場每天可多售出2件,若商場每天要盈利1200元,每件應(yīng)降價多少元
··················································································································
某工程隊在我市拆遷,原計劃每天拆遷1250㎡,第一天少拆遷了20%,從第二天開始加快了速度,第三天茶錢了1440㎡
求①該工程隊第一天拆遷的面積
②若該隊第二天第三天的拆遷面積比前一天增長了百分數(shù)相同,求這個百分數(shù)