An example in Scheme:

Given the function:

(define addsalestax
  (lambda (taxrate)
    (lambda (x)
      (+ x (* x (/ taxrate 100.0))))))
you can use currying to define the following:
(define ny (addsalestax 8))
(define oh (addsalestax 5.5))
and use them like this:
>(ny 10.00)
10.8