Step-by-step explanation:
We know that revenue= production=break even point
given that the expression for cost of production is
z=120+4x---------------1 cost of production
where x is the number of items produced
also the selling price per item is $5
The revenue generated from the production of x items is(let the revenue be y)
y=5x------------2 revenue equation
break-even is when y=z
120+4x=5x
solving for x we have
120=5x-4x
120=x
x=120items