Day 45 -- Riddle

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Tom recently went to the shop and purchased 4 items.

Three of the items cost:

$1.50
$3.00
$4.00

There was quite a long queue, and as Tom was quite bored, he was playing with his pocket calculator whilst waiting.

Very curiously, the 4 prices added to the same number as he got when he multiplied the 4 prices together.

What was the price of the 4th item?

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