For this case we have that variable "m" represents the cost of Jake's food. They tell us that he left an 18% tip. That is to say:
m -------------> 100%
tip ------------> 18%
Where "tip" is the cost of the tip based on the cost of the meal.
![tip = \frac {18 * m} {100}\\tip = 0.18m](https://img.qammunity.org/2020/formulas/mathematics/college/pc5jgc61ee7czrrerics1bmi5iqaltbtny.png)
The amount Jake pays is represented by:
![m + 0.18m](https://img.qammunity.org/2020/formulas/mathematics/college/5sgfsvierjw26d2uksm2rpj1kv5yq2zw2s.png)
Where 0.18m is the tip
ANswer:
Tip