Answer:
Explanation:
The best answer from the choices provided is:
a. take 10% of $85
To calculate the successive discounts of 15% and 10% on a $100 item, you first apply the 15% discount to the original price, which leaves you with $85. Then, you apply the 10% discount to this reduced price of $85. So, you take 10% of $85, which is the correct step in the calculation of the final discounted price.