If the net price of a stove is $900 and the trade discount rate is 40 percent, the list price is:
$3,600, $2,250, $1,500, $1,260, $1,440

Solution:

Net price of a stove = $900

Trade discount rate = 40% = 40/100 = $0.40

Discount = 0.40x

Consider listed price = x

The listed price can be determined from the formula:

Discount = Listed price - selling price

0.40x = x - 900

⇒ x - 0.40x = 900

Solving for x, we get 

0.60x = 900

x = $1500

Therefore, the listed price is $1500.

If the net price of a stove is $900 and the trade discount rate is 40 percent, the list price is:
$3,600, $2,250, $1,500, $1,260, $1,440

Summary:

If the net price of a stove is $900 and the trade discount rate is 40 percent, the list price is $1500.