A taxpayer registered under VAT system on January 1,2018. His records during the month show: Value of inventory as of Dec 31,2019 50,000 VAT paid on inventory as of December 31,2019 6,000 VAT exempt goods 60,000 Sales , net of VAT 140,000 Sales, gross of VAT 45,000 Purchases, net of VAT 70,000 Compute for the VAT payable