Creating and Using a Cost Formula Big Thumbs Company manufactures portable flash drives for computers. Big Thumbs incurs monthly depreciation costs of $15,400 on its plant equipment. Also, each drive requires materials and manufacturing overhead resources. On average, the company uses 18,250 ounces of materials to manufacture 7,300 flash drives per month. Each ounce of material costs $3.00. In addition, manufacturing overhead resources are driven by machine hours. On average, the company incurs $43,800 of variable manufacturing overhead resources to produce 7,300 flash drives per month. In your calculations, round variable rate per flash drive to the nearest cent. If required, round final answers to the nearest cent. Required: 1. Create a formula for the monthly cost of flash drive for Big Thumbs