What is the main idea for the maze runner

Thomas wakes up in a strange elevator, with memories lost and no idea what is going to happen. He is accepted into a glade full of other teenage boys who call themselves "Gladers." After learning about the Maze that surrounds them all, Thomas becomes obsessed with finding a way out, which could mean certain death.

200 greeting cards must be sold in order to achieve the breakeven. By seeling 200 greeting cards the company will be in position of no profit and loss position.

Explanation:

The breakeven point could be found from the following formula:

Breakeven Point = Fixed Cost / Contribution per unit Eq 1

Here

Contribution per unit = Selling Price - Variable Cost

Contribution per unit = $3 - $1 = $2 per unit

Putting values in the equation 1, we have:

Breakeven Point = $400 / $2 per unit = 200 units