Mattress World is a retailing business that sells mattresses. The expected sales volume (i.e. units of product to be sold) for the first four months in 2020 are as follows: Month January February March April Sales (unit) 100 140 130 120 The following additional information is available: Budgeted purchase price for mattresses is $100. 30 units were in the inventory at the end of December 2019. Mattress world maintain an ending inventory balance of 30% of the next month's expected sales. . Required Prepare the Inventory and Purchase Budget for the first three months in 2020