Question 4 Dvent budgets 18 000 machine hours for the production of computer chips in August 2018. The budgeted variable overhead rate is R6 per machine-hour. At the end of August, there is a R375 favourable spending variance for variable overhead and a R1 575 unfavourable spending variance for fixed overhead. For the computer chips produced, 14 850 machine- hours are gudgetd and 15 000 machine-hours are actually used. Total actual overhead costs are R120 000 Required: Calculate efficiency and total variance for Dvent's variable overhead in August 2018. 4.1