To find the average price, we can calculate the weighted average by multiplying each price by the number of items and then dividing the total cost by the total number of items.

Here's the step-by-step process:

1. Multiply each price by the number of items:

   • $8 \times 150 = 1200$
   • $6 \times 140 = 840$
   • $18 \times 130 = 2340$
   • $18 \times 125 = 2250$

2. Add the total costs: $1200 + 840 + 2340 + 2250 = 6630$

3. Add the total number of items: $8 + 6 + 18 + 18 = 50$

4. Divide the total cost by the total number of items to get the average price: $\frac{6630}{50} = 132.60$

So, the average price is $132.60.

Would you like further details or have any questions?

Here are 5 related questions you can explore:

1. How does changing the price of one category affect the overall average?
2. What is the median price of these items?
3. How would the total cost change if you increased the quantity of the 140.00 items?
4. What would the average price be if you added another 10 items at 135.00?
5. How can we use this weighted average method in a different scenario, such as grades?

Tip: Weighted averages are especially useful when dealing with different quantities of grouped data.