30 November 2015
There is no provision which prohibits such a large discount. However, if it is given at the time of cash sale then only the sale should be recorded at Rs.5,000. Cash discount is recorded only if it is given after a credit sale.
04 December 2015
Your selling price can be Rs.5,000 + VAT or 5,000 all inclusive, that depends on you. If it is all inclusive then you have to split up Rs.5,000 into selling price + VAT.