Final answer:
The cost of each necklace is calculated by dividing the total amount spent by Rosa, $11.52, by the total number of necklaces, which is 16. This results in each necklace costing $0.72. Therefore, the correct answer is option a) $0.72
Step-by-step explanation:
To find the cost of each necklace, we must divide the total amount spent by Rosa by the total number of necklaces she bought. It was given that Rosa spent $11.52 in total on necklaces for each of her two friends and she bought eight necklaces in total.
Here is the calculation:
- First, we find the total number of necklaces: Rosa bought 8 necklaces for each of her 2 friends, which is 8 necklaces × 2 friends = 16 necklaces in total.
- Next, we calculate the cost per necklace: $11.52 ÷ 16 necklaces = $0.72 per necklace.
Therefore, the cost of each necklace is $0.72, which corresponds to option a) $0.72.