Answer:
The bill before tax and tip was $11.60. Then, a sales tax of 7.5% was added, which is $0.87. So, the total cost of the meal before tip was $11.60 + $0.87 = $12.47. Rajani tipped 12% on the amount after the added sales tax, 12% of $0.87 = $0.10. Therefore, the total cost of the meal, including tax, tip, and the original bill, was $12.47 + $0.10 = $12.57.
Explanation: