Rita makes and sells necklaces. the materials to make each necklace cost $2.75. last week she made 8 necklaces and wants to make a total profit of $78. using the equation 8(x+2.75)=78, rita determined that she needs to sell each necklace for $7 to make a total profit of $78. which error did rita make?

Rita made a sign error.

Step-by-step explanation:

Let x be the selling price of each necklace.

We are told that the materials to make each necklace cost $2.75.

Since profit is the difference between selling price and cost.

So profit of Rita from selling one necklace will be:

To find the profit of Rita from selling 8 necklace we will multiply 8 by profit of 1 necklace.

As Rita wants to make a total profit of $78 from selling 8 necklaces, so we will substitute 78 as profit of 8 necklaces.

Upon comparing our equation with the given equation we can see that Rita made a sign error as she added the cost with the selling price instead of subtracting the cost from selling price.

Let us find the selling price.

We can see that the selling price of each necklace will be 12.5, therefore, Rita made a sign error.

answer: 7

step-by-step explanation:

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