Answer:
The cost of material is equal to $30
Step-by-step explanation:
From the given question, Valerie first has to buy materials before she can make and sell bracelets.
In this question we will assume that the same amount of materials was purchased for each case on the table.
When the number of bracelet sold is zero, the cost of bracelet sold will be zero.
So,
From the table, at number of bracelet sold = 0, the profit is -$30;
Therefore, the cost of material is equal to $30