The equation for cost is C=1000+0.10Q where Q is the number of candy bars produced. This shows $1000 fixed cost and $0.10 cost for each one made.
Sales S=0.60Q that is, $0.60 for each candy bar sold.
At break-even, C=S so 1000+0.10Q=0.60Q and 0.50Q=1000 so Q=1000/0.50=2000.
So 2000 candy bars have to be made and sold to break even (zero profit).