Answer:
Stupid pay for the tool is $25.3 (Approx) .
Explanation:
Stupid buying a $35 tool. 
The store reduces the price by 5% and then applies an $8 off coupon. 
5% is written in the decimal form.

= 0.05
Price reduces = 0.05 × 35
 = $ 1.75
Total cost of the tool = Original cost of tool - Price reduces - Coupon off
Here 
Original cost of tool = $35
Coupon off = $8
put in the above
Stupid pay for the tool = 35 - 1.75 - 8
 = 35 - 9.75
 = $25.3 (Approx)
Therefore Stupid pay for the tool is $25.3 (Approx) .