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Banner Systems is a​ start-up company that makes connectors for​ high-speed Internet connections. Banner has budgeted three hours of direct labor per​ connector, at a standard cost of $ 13 per hour. During​ August, technicians actually worked 190 hours completing 78 connectors. All 78 connectors actually produced were sold. Banner paid the technicians $ 13.80 per hour. What is Banner's direct labor efficiency variance for​ August?