What was the price of the fourth item?

Question

When I went to the store, I purchased four items. The following shows the cost of three of the items:

Rs 1.50
Rs 3.00
Rs 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?

Answer 1

Fourth item costs 0.50