As of December 31, 2017, Stand Still Industries had $2,500 of raw materials inventory. At the beginning of 2017, there was $2,000 of materials on hand. During the year, the company purchased $375,000 of materials; however, it paid for only $312,500. How much inventory was requisitioned for use on jobs during 2017?

1). $324,500 

2). $374,500 

3). $313,000 

4). $312,000