please write the formula please i can step by step. please!!!!!!!!

Task 4: E-books, an online book retailer, has two operating departments-corporate sales and consumer sales--and two support departments--human resources and information systems. Each sales department conducts merchandising and marketing operations independently. E-books uses number of employees to allocate human resources costs and processing time to allocate information systems costs. The following data are available for September 2021: SUPPORT DEPARTMENTS OPERATING DEPARTMENTS Human Information Corporate Consumer Resources Systems Sales Sales Budgeted costs incurred before any interdepartment cost allocations $ 72,500 S 235,300S 995,720 498,680 Support work supplied by HR department Budgeted number of employees 31 41 28 Support work supplied by IS department Budgeted processing time (in minutes) 90 380 530 1. Allocate the support departments' costs to the operating departments using (a) direct method, (b) the step-down method (allocate IS first), and (c) reciprocal method (using linear equations). Round your answers to the nearest whole number. 2. Define "support department" and "operation department" in your own words. 3. What is the main difference between the two methods used for allocating costs to support departments: single rate and dual rate? 4. How do you understand the concept of practical capacity