Answer:
$8.05 is the effective price per year of the extended warranty.
Explanation:
The cost of the lawnmower is = $284
The six year extended warranty on the lawnmower costs 17% as much as the lawnmower itself.
This means 
 is the warranty for 6 years.
 is the warranty for 6 years.
So, per year effective price is = 
 ≈ $8.05
 ≈ $8.05
Therefore, $8.05 is the effective price per year of the extended warranty.