Trying to replace a bashism in bourne sh

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From: D'Arcy Cain <darcy_at_druid.net>
Date: Mon, 06 Nov 2023 19:45:33 UTC

I need to do this;

   ifconfig_eth3="inet $((16#c0a8c0${me} + 100))/24"

Problem is that I need to do this at boot time but then it runs as 
bourne sh.  Does anyone have an equivalent for sh?

Cheers.

-- 
D'Arcy J.M. Cain <darcy@druid.net>         |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
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