Thelma is a real estate agent negotiating the sale of a property with a listed price of $180,000. The buyer and seller of the property have agreed to a sale price that is 15% lower than the listed price.

If Thelma earns a 6% commission based on the negotiated sale price, how much will she earn for this sale?

$1,620

$4,500

$9,180

$12,420