Answer: $72
Explanation:
To find out how much Stefan spent originally, we need to divide the total cost for Jin by 160% (or 1.6). Let's call the og cost "x."
160% of x is equal to the total cost for Jin, which is $173 for the bike and $19 for the helmet.
So, we can set up the equation:
1.6x = 173 + 19
Simplifying this equation, we have:
1.6x = 192
To find the value of x, we divide both sides of the equation by 1.6:
x = 192 / 1.6
Calculating this, we find that Stefan spent $120 originally.
To determine how much money Stefan made by selling the bike and helmet to Jin, we subtract the original cost from the total cost Jin paid:
$173 + $19 - $120 = $72
Stefan made $72 by selling the bicycle and helmet to Jin.