Mark works at a popular electronics retail store. He earns a fixed income of $18 an hour and a 5% commission on the sales he makes.


Let's say,

y = earnings

h = number of hours worked

s = amount of sales


Which of these equations correctly indicates how much Mark earns in a day?


A : y=18h+0.5s

B : y=18h+0.05s

C : y=h/18+5s

D : y=h/18+s/5