The term incremental cost is identified in base64 scheme by the sequence aW5jcmVtZW50YWwgY29zdA==, while the MD5 signature is equal to f73a117a0a940d7a2fc83f2c202a60a7. The ASCII encoding of incremental cost in hexadecimal notation is 696e6372656d656e74616c20636f7374.