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...
print $v{hourly_worker_cost};

Global symbol "$costs" requires explicit package name at test.pl line 
+13.
Execution of test.pl aborted due to compilation errors.

my %costs = \$v{hourly_worker_expenses};

...
my $costs = \$v{hourly_worker_expenses};

I originally didn't even mess around with the $costs/%costs hash and I
+ tried to do the += with $cost and $v{hourly_worker_expenses}