Hailey works at a gift shop after school. she is paid $10 per hour plus 15% commission on merchandise she sells. select an equation that represents her earnings in a week if she sold $550 worth of merchandise. a. y= 10x 535, where x =number of hours worked b. y= 0.15x 10, where x =merchandise sold c. y= 10x 82.5, where x =number of hours worked d. y= 10x 522.5,where x =merchandise sold