I didn't run your script because I installed p5-tk with MacPorts and got a display error, I think because I have to install xquartz and I'm not interested in doing that right now on this machine. I did just now run the below though, with a 5.34 perl installed via MacPorts on an M1 mac:
% uname -a
Darwin ... 21.6.0 Darwin Kernel Version 21.6.0: Mon Apr 24 21:11:17 PD
+T 2023; root:xnu-8020.240.18.701.5~1/RELEASE_ARM64_T6000 arm64
% perl -le 'print 12.99 * 16.25'
211.0875
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