7. Tech Company produces computer servers. Variable overhead is allocated to each server based on a standard of $100 per machine hour and 3 machine hours per server. A total of 850 machine hours were used during the month of August to produce 300 servers. Variable overhead costs totaled $96,050 for the month. a) Calculate the variable overhead spending variance for the month of August. Clearly indicate if the variance is favorable or unfavorable. b) Calculate the variable overhead efficiency variance for the month of August. Clearly indicate if the variance is favorable or unfavorable