Gourmet Aroma Coffee House Has an Exclusive Contract with Columbia

Gourmet Aroma Coffee House has an exclusive contract with Columbia exporters.Two brands of gourmet coffee are imported,Morning Thunder (MT) and Evening Tender (ET) .The following data are provided for the current fiscal year:
The total market was estimated to be 80,000 pounds at the time of budget.The actual total market for the year is 75,000 pounds.
What is ET's sales mix variance?

A) $7,680 favorable.
B) $8,640 favorable.
C) $11,520 favorable.
D) $12,960 favorable.
E) $24,960 favorable.