i tried executing it but it yields the ff. error:
C:\Users\user\Desktop\perl>perl test4.pl
Argument "" isn't numeric in addition (+) at test4.pl line 24, <$fh> l
+ine 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh>
+line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh>
+line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh>
+line 11.
Use of uninitialized value in hash element at test4.pl line 25, <$fh>
+line 11.
Argument "" isn't numeric in addition (+) at test4.pl line 24, <$fh> l
+ine 11.