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税込み価格への修正 (Nested Flatten)
(including-tax "ダイコン150円、ハクサイ120円、ジャガイモ30円")

=>"ダイコン157円、ハクサイ126円、ジャガイモ31円"
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(define (including-tax str)
  (let ((rep (lambda (m) (x->integer (floor (* (string->number (m 0)) 1.05))))))
    (regexp-replace-all #/\d+/ str rep)))

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