A store has two different brands of laundry detergent. Brand A can do 105 loads of laundry and costs $21.99. Brand B does 80 loads of laundry and costs $17.99. Which laundry detergent is the better buy and what is that detergent's unit price?
Answers:
A. Brand A $0.20
B. Brand A $0.21
C. Brand B $0.22
D. Brand B $0.23​