- Forty Company has the following information for the month. Compute the variable overhead spending variance, variable overhead efficiency variance, and the total variable overhead variance based on the following information: e Standard variable overhead rate: $6.00 per direct labor hour o Actual variable overhead costs: $10,000 e Standard hours allowed per unit: 0.50 hours e Actual direct labor hours worked: 2,000 hours e Units produced: 3,500