Bone-shaped treats are five for 3: 50 at shelly store in sarah wants to buy 12 she set up and solve this proportion to find how much they would cost describe her error and find the correct solution

8.4 dollars

Step-by-step explanation:

The error is in the resolution of the proportion. In fact, the initial proportion is correct:

where x is the total cost. However, the following step of the resolution is wrong. In fact, the correct resolution is the following:

- Multiplying by x on both sides:

- Multiplying by 3.5 no both sides:

And now we can find x:

So, the total cost is 8.4 dollars.