You have the following data. Calculate cash from customers. 2019 18000 6000 200 Sales COGS R&D expense Salary and wages Interest expense tax expense 2020 18500 8000 400 8100 7000 A/R 2000 1000 15000 11000 22000 2000 A/P Inventory Prepaid expenses Taxes payable interest payable 1500 1200 13000 9000 23000 3000 100 1100 400 1200