Final answer:
To find the commission amount, multiply the selling price by the commission rate, which can be calculated as 100% - the percentage the student receives. In this case, the commission taken on the sale of a $140,100 house would be $21,015.
Step-by-step explanation:
In order to calculate the amount of commission taken on the sale of a house, you can multiply the selling price by the commission rate. In this case, the student receives 85% of the selling price, so the commission rate would be 100% - 85% = 15%. To find the commission amount, multiply the selling price by the commission rate: 140100 * 0.15 = $21,015. Therefore, the commission taken on the sale of a $140,100 house would be $21,015.