# Python, <s>39</s> 38 bytes

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    lambda s:sum(ord(i)-96for i in s)==100

[Try it online!]

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-1 byte thanks to @JonathanAllan

[Try it online!]: https://tio.run/nexus/python2#JYxBCoMwEEX3nmKYVUK12E2hQnqRtouJMTQQtSSThYpnt5H81YP/eFa9D0@jNgSxi2kUczDCyeZxt3MAB26CKJW6te3BIfF3AQUv1GldF6yxT55TGDKRcaSJXU/eL/ipLPk4FJl0jzXgmnceOctntuQuRewq@AU3MeC2Q/OEbcdrNkdiwTVYwVIefw "Python 2 – TIO Nexus"