Amount that Abelita and Franco want to give tip to the server=20 Percent
Total Amount of Bill=11.72
Expressions which will be equal to total bill, including tax and gratuity
[tex]=11.72 +11.72 \times \frac{20}{100}\\\\=11.72+[(0.2)\times 11.72]\\\\=11.72 \times(1+0.2)\\\\=11.72 \times 1.02[/tex]
Option C→11.72+0.2×(11.72)
And Option D→11.72×(1.02)