When I went to the store, I purchased four items. The following shows the cost of three of the items: $1.50 $3.00 $4.00 The line to the checkout was pretty long, so to quench my boredom I started playing with my pocket calculator while waiting. I found out, to my surprise, that the four prices of the four items I purchased added to the same number as I got when I multiplied the four prices together. What was the price of the fourth item?