Answer:
Dry cleaning service at Spot-Less DryCleaners is the best deal
Step-by-step explanation:
The total expense of getting four shirts dry cleaned at Spot-Less DryCleaners
[tex]= 4.5 * 4 = 18[/tex] dollars
The total expense of getting four shirts dry cleaned at No Mess or Stress Dry Cleaner
[tex]21[/tex] dollars
The best deal would be where the expense will be the least.
Hence dry cleaning service at Spot-Less DryCleaners is the best deal.