Final answer:
If Susan invests $10,000 in a mutual fund that charges a 9% commission, the financial planner will be paid $900.
Step-by-step explanation:
If Susan invests $10,000 in a mutual fund that charges a 9% commission, the financial planner will be paid $900. To calculate this, multiply the investment amount ($10,000) by the commission rate (9%) and divide by 100. So, $10,000 x 9/100 = $900.