Answer:
Her wage on the 8th day is $105 ⇒ answer d
Explanation:
* Lets explain how to solve the problem
- The average of set of data = The sum of data/the number of data
- The sum of data = the average of set of data × the number of data
∵ Cindy worked for 15 consecutive days
∵ She is earning an average wage of $91 per day
∴ Her total earning = 91 × 15 = $1365
∵ Her average earning during the first 7 days is $87 per day
∴ Her total earning in the first 7 days = 87 × 7 = $609
∵ Her average earning during the last 7 days is $93 per day
∴ Her total earning in the last 7 days = 93 × 7 = $651
- Her total earning in the 14 days is the sum of the earning in the
first 7 days and the earning during the last 7 days
∵ Her total earning in the 14 days = 609 + 651 = $1260
∵ Her total earning in the 15 days is $1365
- To find her wage on the 8th day subtract her wage of the 14 days
from her wage of the 15 days
∴ Her wage on the 8th day = 1365 - 1260 = $105
* Her wage on the 8th day is $105