(i) Cost price for wholesaler =Rs.25,000
Marked price =Rs.25,000+20100×Rs.25,000
=Rs.30,000
(ii) Discount =10% of 30,000=Rs.3,000
Cost price for retailer = Marked price − Discount
=Rs.30,000−Rs.3,000
=Rs.27,000
Cost price inclusive tax =Rs.27,000+8100×Rs.27,000
=Rs.29,160
(iii) Cost price for wholesaler =Rs.25,000
Sale price for wholesaler =Rs.27,000
Profit for wholesaler =Rs.27,000−Rs.25,000=Rs.2,000
VAT =8100×Rs.2,000
=Rs.160.