#| BEGIN (Введите свое решение) |#
(define (make-center-width c w)
    (make-interval (- c w) (+ c w))
  )

(define (width i)
  (/ (- (upper-bound i) (lower-bound i)) 2)
  )

(define (percent i)
  (* 100 (/ (width i) (center i)))
  )

(define (make-width center percent)
  (/ (* center percent) 100)
)

(define (make-center-percent center percent)
  (make-center-width center (make-width center percent))
  )
#| END |#