Final answer:
Mary will pay Carol approximately $21,081.44 at the end of 269 days with an interest rate of 12%.
Step-by-step explanation:
To calculate the amount Mary will pay Carol at the end of 269 days with an interest rate of 12%, we can use the formula:
Amount = Principal + (Principal * Rate * Time)
In this case, the Principal is $20,300, the Rate is 12% (or 0.12 as a decimal), and the Time is 269 days.
Using the formula, we can calculate:
Amount = $20,300 + ($20,300 * 0.12 * (269/365))
Amount = $21,081.44 (approx)
Therefore, the amount Mary will pay Carol at the end of 269 days is approximately $21,081.44.