Answer:
16.67% percent saved by buying 3.
Step-by-step explanation:
Cost of 1 beach towel = $10
Then cost of ten towels = 
But at beach bunch of 3 towel was of $25.
Amount saved by purchasing bunch of 3 towel at once :$30 - $25 =$5
Percent saved by buying 3:

16.67% percent saved by buying 3.