To determine how many t-shirts Joanne needs to sell to break even, we can start by setting up the equation.
Let \( x \) be the number of t-shirts sold.
Expenses:
- Fixed costs (supplies): $80
- Variable cost per t-shirt: $2
- Total cost for \( x \) t-shirts: \( 80 + 2x \)
Revenue:
- Selling price per t-shirt: $6
- Total revenue for \( x \) t-shirts: \( 6x \)
To break even, total revenue must equal total costs:
\[ 6x = 80 + 2x \]
Now, we can solve the equation:
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Subtract \( 2x \) from both sides: \[ 6x - 2x = 80 \] \[ 4x = 80 \]
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Divide both sides by 4: \[ x = 20 \]
So, the equation is \( 6x = 80 + 2x \).
It will take Joanne selling 20 shirts to break even.