Answer:
Surfmania, $3.40 in savings
Explanation:
First, find the price with Surfmania:
170(0.7)
= 119
Find the price with Coolwaves now:
170(0.9)
= 153
153(0.8)
= 122.4
Now, find the amount in savings:
122.4 - 119
= 3.4
So, Surfmania has the better deal with $3.40 in savings.