if (businessCall.value = "Yes_bus") {
...
Can't modify concatenation (.) or string in scalar assignment near ""Yes_bus")

That's an entirely descriptive message. You have a scalar assignment (=) when what you almost certainly want is a string equivalence test (eq). On the left hand side you have a concatenaction (.) between two barewords.

Perhaps it's time to stop typing and have a nice cup of tea and a slow, steady read through perlintro and perlsyn?

In reply to Re^2: If statement based on Radio Button Values by hippo
in thread If statement based on Radio Button Values by jaacmmason

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