A company is planning to manufacture mountain bikes. The fixed monthly cost will be $400,000 and it will cost $200 to produce each bicycle.

I'm guessing that this is supposed to be an equation for cost.

First we take the 400,000, and add it to the rest,

400,000 +, now we add a variable,

400,000 + x, since it costs 200 dollars to make a bike, we'll add it to the variable,

400,000 + 200x < there's your equation!

Well if you want a equation for this it would be 200x+400000 = Let me know if there is something else that you wanted for this question.