Answer:
As per the statement:
At a hardware store a tool set normally cost $80.
Cost of a tool set usual= $ 80.
During the sail this week the tool set cost $12 less than usual.
Cost after sail = $ 80 - $12 = $68
We have to find the percentage of the usual price is the savings.
Saving price on a tool set = $12

Substitute the given values we get;

Simplify:
Percentage of the usual price is the saving = 15%
Therefore, the percentage of the usual price is the saving is, 15%