Answer: Spent $120 originally, profited by $36
Explanation:
The total cost Stefan earned from selling the helmet and the bicycle is $139 + $17 = $156.
130% can be rewritten as
which is simplified to 1.3.
Set up and this equation to find 130% of this price.

Stefan spent $120 on these items.
Subtract this value from the selling price and solve.

Stefan made $36 from selling the helmet and bicycle.