Final answer:
To find out how much Sandra pays for the emerald pendant after the 15% discount, subtract 15% of the original price from the original price. Sandra pays $170 for the emerald pendant after the 15% discount.
Step-by-step explanation:
To find out how much Sandra pays for the emerald pendant after the 15% discount, we need to subtract 15% of the original price from the original price.
First, calculate 15% of $200:
15/100 * $200 = $30
Next, subtract $30 from $200 to find out how much Sandra pays after the discount:
$200 - $30 = $170
Therefore, Sandra pays $170 for the emerald pendant after the 15% discount.