need asap

19. A department manager spent $ 100 more than 1/4 of his monthly budget during the first week of the month and had 2/3 of the total amount left. How much did he spend during the first week? $ 300 (b) $ 400 $ 800 le) $ 600 (e) $ 1,200 (a) 20. A manufacturing plant has equal stocks of two different raw materials. In one month, it used 4/5 of one kind and 9/10 of the other. What proportion of the total amount of raw materials is unused ? 2/15 (b) 3/20 (c) 1/5 (d) 3/10 fel 4/15