estion 12 (5 points) Extreme Builders constructs houses. The standard labor rate is $25 per hour and the standard number of hours is 15,000 hours per house. During the year, it constructed 12 houses using 18,000 labor hours per house at a rate of $28 per hour. Calculate the Extreme Builders's labor rate variance. $540,000 U $648,006U $648,000 F $540,000 F