Final answer:
The plantwide factory overhead rate for Ricky Corp is $7.00 per machine hour, calculated by dividing the budgeted overhead costs by the budgeted machine hours.
Step-by-step explanation:
To calculate Ricky Corp's plantwide factory overhead rate for the current year, we divide the budgeted overhead cost by the budgeted machine hours. The budgeted overhead cost is $700,000 and the budgeted machine hours are 100,000 hours. Therefore, the overhead rate is calculated as $700,000 รท 100,000 hours = $7.00 per machine hour. This calculation assumes a plantwide allocation where a single overhead rate is used across all departments and products, and does not take actual overhead costs or hours into consideration.