Please double check your answer, thank you .. I try so hard to slove it I did not get the right answer

The Darca Manufacturing Company has the following labor standards have been established for a particular product Question 30 Not yet answered Points out of 3 PFlag question Standard labor-hours per unit of output.. 7.5 hours The following data pertain to operations concerning the product for the last month: Actual hours worked... Actual total labor cost.... Actual output... What is the labor efficiency variance for the month? 9.600 hours $144,480 1.200 units Select one: a $7,230 U '-' b. $9,030 U c. $7,230 F d. $9,150 U