How much would a pair of underwear cost?

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Riddle:
There is a clothing store in Bartlesville.
The owner has devised his own method of pricing items.
A vest costs $20,
socks cost $25,
a tie costs $15
and a blouse costs $30.
Using the method,
How much would a pair of underwear cost?

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Answer :
The Logic he derived is,
$5 for every letter of the item.
So Underwear costs 9 x $5 = $45