Explanation:

When a seller sells goods to a buyer, he adds a certain percentage of profit to the cost price to make a profit. In this case, the seller sold goods to Y at a 30% profit. Additionally, the buyer gets a 10% trade discount. Let's break down the transaction in detail.

Cost Price:
The cost price is the amount that the seller paid for the goods. In this case, the seller sold goods to Y costing 10000.

Selling Price:
The selling price is the price at which the seller sells the goods to the buyer. The seller added a 30% profit to the cost price to arrive at the selling price.

Profit = 30% of Cost Price = (30/100) x 10000 = 3000

Selling Price = Cost Price + Profit = 10000 + 3000 = 13000

Trade Discount:
The buyer is entitled to a 10% trade discount. This is a discount that is given to the buyer for purchasing the goods. The trade discount is calculated on the selling price.

Trade Discount = 10% of Selling Price = (10/100) x 13000 = 1300

Net Selling Price:
The net selling price is the amount that the buyer pays after deducting the trade discount from the selling price.

Net Selling Price = Selling Price - Trade Discount = 13000 - 1300 = 11700

Therefore, the seller sold goods to Y costing 10000 at a 30% profit and a 10% trade discount. The net selling price of the goods is 11700.