The following materials standards have been established for a particular product:

Standard quantity per unit of output	6.3	grams
Standard price	$10.50	per gram

The following data pertain to operations concerning the product for the last month:

Actual materials purchased	8,000	grams
Actual cost of materials purchased	$108,000
Actual materials used in production	7,700	grams
Actual output	1,120	units

What is the materials quantity variance for the month?

$8,694 U

$4,050 U

$6,762 U

$9,390 U