The amount she earned during the week is $320
Using the parameters given for our Calculation;
- tip rate = 15% of cost of orders
- cost of orders = 40
- Work hour = 4 - 8hour shift
- Earning per hour = $4
The total number of hours worked = (4 × 8) = 32 hours
Total earnings from.hours worked = (32 × 4) = $128
The percentage earning from tip = (40 × 0.15) = 6
Tip earned after 32 hours = 6 × 32 = $192
Total earning = 128 + 192 = $320
Hence, her week's earning is $320