Hello there! $750 is the fixed amount she made this week. She earns 3% commission on the house she sold, which was $250,000. To find out how much money Gail made off of selling that house, multiply 250,000 by 3% in decimal form. 3% is 0.03 in decimal form. 250,000 * 0.03 is 7,500. Gail made $7,500 in commission this week. She earns another $750. 7,500 + 750 is 8,250. There. Gail made $8,250 this week.