A firm has two inputs: X and Y. The firm understands these inputs to be substitutable. The firm's standard mix is 2 unit(s) of input X for every 12 unit(s) of input B.

Input X costs $20 per unit

Input Y costs $7 per unit

The firm's actually used 4,000 total input units, with 1,000 units of input X and 3,000 units of input Y.

What is the firm's mix variance for these inputs?

NOTE: only input a number, without indicating favorability (for simplicity, I've made sure that the relevant variance equation leads to a positive number). Round final answer to cents if necessary.