inal answer:
The evidence the writer provides to support the main argument is that customers pay a large percentage of server's salaries. This is mentioned in the passage when it states that waitstaff in restaurants can make less than minimum wage and rely on tips from customers to supplement their income.
Step-by-step explanation:
The evidence the writer provides to support the main argument is that customers pay a large percentage of server's salaries. This is mentioned in the passage when it states that waitstaff in restaurants can make less than minimum wage and rely on tips from customers to supplement their income. The passage explains that the assumption is that diners will leave a 15 to 20 percent tip that adds to the server's pay, but this can be unstable since some diners don't tip or tip distribution varies.