Determine whether each sentence makes sense, write down your supporting answer with your reasoning for it making sense or not making sense with your...

Determine whether each sentence makes sense, write down your supporting answer with your reasoning for it making sense or not making sense with your calculations. 

1. I have $100 and my restaurant bill comes to $81, which is not enough to leave a 20% tip. 

2. My rent check increased from 20% to 30% of my monthly income, so the percent increase in my monthly rent check is 10%.

      Do these sentences make sense or do they not? Why or why not?