Let X be defined as the number of toys Jermy makes in a given month.
Cash outflow consists of fixed cost and variable cost:
Fixed cost = $594 This amount does not depend on how many toys Jermy produces.
variable cost= $8*X This depends on how many toys he makes. For example 3 toys would be 8*3=$24
Cash inflow (how much he makes):
$35*X Note that obviously this depends on how many toys he is selling.
For breakeven we should have: 594+8X=35X
subtracting 8X on both sides we get: 594=27X
So X=594/27= 22
Hence he needs to sell 22 toys in a given month to break even.