I can see the math problems from the image you uploaded. Let's start solving the problems one by one.

Problem 9:

• Janice's Commission
  Janice receives a 5% commission for selling a condominium unit worth ₱4,000,000.
  The commission is calculated as: $\text{Commission} = 0.05 \times 4,000,000 = ₱200,000$ Janice will receive a commission of ₱200,000.

Problem 10:

• Price of the Tuxedo Suit with Sales Tax
  The price of the tuxedo suit is ₱6,200, and a sales tax of 6% is imposed.
  The total price is: $\text{Total Price} = 6,200 + (0.06 \times 6,200) = 6,200 + 372 = ₱6,572$ The total purchase price is ₱6,572.

Problem 11:

• Tax Rate for the Computer Set
  The price of the computer set is ₱32,000, and the sales tax amounts to ₱2,720.
  The tax rate $r$ can be found by: $r = \frac{\text{Tax Amount}}{\text{Price}} = \frac{2,720}{32,000} = 0.085 = 8.5\%$ The tax rate is 8.5%.

Would you like to proceed with the remaining problems? Let me know if you need further clarifications!

Here are some related questions:

1. How would you calculate the total cost of multiple items if different tax rates are applied?
2. What is the formula for calculating a commission at various percentage rates?
3. If the sales tax increased from 6% to 10%, what would be the new price of the tuxedo?
4. Can you determine the tax amount if only the total cost and tax rate are known?
5. How would the calculation change if Janice's commission rate was not fixed but varied based on the sale price?

Tip: Always break down percentages into decimal form when performing calculations.