can you show your work w/ formula and numbers so i can understand ?

a 8. Hanson Inc. has the following material standard to manufacture one Zippy: 1.5 pounds per Zippy at $4.00 per pound. Last week, 2,800 pounds of material were purchased at a total cost of $10,920, and 1,700 pounds were used to make 1,000 Zippies. The quantity variance is unfavorable. a. $800 b. $500 c. $1800 d. $1000