SharpAudio, Inc makes MP3 players and uses standard costing. They recently used 30,000 labor hours to produce 6,000 units. According to their standards, each unit is anticipated to take 4.5 hours. The company's actual payroll cost amounted to $375,000. If the standard labor cost per hour is $12, Calculate the company's labor efficiency variance. (Enter a positive number for a favorable variance and a negative number for an unfavorable variance).