Riding Corporation manufactures and sells electric cars. Expected sales and production (in units) for the upcoming months of 2020 are as follows: Expected unit sales December October November 7,000 9,000 10,000 Units to be produced 9,000 10,000 11,000 10 pounds of silver are needed to produce each car. Riding's policy has always been to have enough raw material on hand at the end of the month to cover 20% of the next month's production requirements. How many pounds of silver should Riding plan on purchasing during the month of October? (Please provide step-by-step on how to drive the final answer; otherwise, no point will be given.)