What replaces the ? in the president face-value puzzle?

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What replaces the ? in the puzzle below?

1 Lincoln
+ 2 Jeffersons
+ 3 Roosevelts
+ 4 Washingtons
+ 5 Kennedys
_______________
?
 
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but it could be
$15.80
or
$11.90
or
$10.81

(if there can be more than 3 digits.)
 
Originally posted by meteor
3.91 Eisenhowers

oops, you were right! I don't know what I was thinking :smile:

Lincoln is on the penny, Jefferson is on the nickel, Roosevelt is on the dime, Washington is on the quarter, and Kennedy is on the half dollar.

1 Lincolns = $.01
2 Jeffersons = .10
3 Roosevelts = .30
4 Washingtons = 1.00
5 Kennedys = 2.50
______________________
Total = $3.91