the production increase by 20 percent,其中by 20 percent在句子中做什么

The p____of the city rose by 20 percent.怎么填? Only by increase the number of doctors by 50 percent ? prope Last year the advertising rate ________ by 20 percent. Last year the advertising rate _______ by 20 percent. 50 percent discount by 20怎么读 by 15 percent/ at 15 percent有什么区别 Last year the advertising rate ________ by 20 percent.A) rai a merchant raises the price of a $100 item by 20 percent.aft concen-tration percent by weight three grades of milk are 1percent,2percent,3percent fat by v 45 percent of the house ____(burn) doen by the fire made by Only by increasing the number of doctors by 50 percent ___ p