$8.05 is the effective price per year of the extended warranty.
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 [tex]0.17\times284=48.28[/tex] is the warranty for 6 years.
So, per year effective price is = [tex]\frac{48.28}{6}= 8.0466[/tex] ≈ $8.05
Therefore, $8.05 is the effective price per year of the extended warranty.