Alyssa got a job as a part-time waitress at a diner. She earns a daily wage of $50 and a 20% tip from the bill amount of the customers she serves. Which equation represents Alyssa’s total daily earnings (y) based on the total bill amount of the customers she serves (x)?
y = 0.7x – 20
y = 0.5x + 20
y = 0.2x + 70
y = 0.2x + 50