The price of three house items is Rs. 30,000 and series discounts are: 5%, 10%, and 15%. What is the net price?

To determine what is left after the discount subtract the discount from 100% (15% --> 85%, 10% --> 90%, 5% --> 95%)

Net price = 0.95(30000) + 0.9(30000) + 0.85(30000)
= 28,500 + 27,000 + 25,500
= 81,000