Answer:
$75.
Step-by-step explanation:
We have been given that Grammy gave the server a $15 tip. The tip was 20% of the cost of dinner.
Let x be the cost of Grammy's dinner. We need to find x such that 20% of x equals to 15. We can represent this information as:
Therefore, the cost of Grammy's dinner was $75.
1 : -3
I hope this is right!
Answer: 71 hours