Time left 1:10:30 For 2020, Mariam's Animal Supply Manufacturing uses machine-hours as the only overhead cost-allocation base.The accounting records contain estimated and actual Manufacturing overhead costs of $100,000 and $120,000 respectively and estimated and actual Machine- hours of 20,000 and 25,000 respectively.Using job costing, the 2020 budgeted manufacturing overhead rate is: O a. $4.80 per machine-hour O b. $4.00 per machine-hour O c. $6.00 per machine-hour O d. $5.00 per machine-hour