Bike and Helmet (combined) = 160 + 16 = 176
Equation: 160% of some number = the cost of the bike and helmet to Jin
160% = 1.6
of = multiplication
some number = x
cost of the bike and helmet to Jin = 176
1.6(x) = 176
x = 110
Stefan spent $110 originally.
176 - 110 = 66
Stefan made $66 by selling the bike and helmet to Jin.
Hope this helps!