Answer:
The bikes sold at break even by the manufacturer is 50 units
Step-by-step explanation:
We know that break even point is given by the following formula,

We are given startup fee = $3500 which is the fixed cost,
the bikes sell for $250 which is the price per unit and
cost per bike is equal to $180
So substituting these values in the formula we get
=

=
= 50
= 50 units which is the number of bikes sold at break even by the manufacturer.