Create ch-2.pl

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+#!perl
+use strict;
+use warnings FATAL => qw(all);
+
+=prompt
+You are given an income amount and tax brackets.
+
+Write a script to calculate the total tax amount.
+
+Example 1
+
+Input: $income = 10, @tax = ([3, 50], [7, 10], [12,25])
+Output: 2.65
+
+1st tax bracket upto  3, tax is 50%.
+2nd tax bracket upto  7, tax is 10%.
+3rd tax bracket upto 12, tax is 25%.
+
+Total Tax => (3 * 50/100) + (4 * 10/100) + (3 * 25/100)
+          => 1.50 + 0.40 + 0.75
+          => 2.65
+
+
+Example 2
+
+Input: $income = 2, @tax = ([1, 0], [4, 25], [5,50])
+Output: 0.25
+
+Total Tax => (1 * 0/100) + (1 * 25/100)
+          => 0 + 0.25
+          => 0.25
+
+
+Example 3
+
+Input: $income = 0, @tax = ([2, 50])
+Output: 0
+=cut
+
+
+use Test2::V0 -no_srand => 1;
+is(tax_amount(10, [[3, 50], [7, 10], [12,25]]), 2.65, 'Example 1');
+is(tax_amount(2, [[1, 0], [4, 25], [5,50]]), 0.25, 'Example 2');
+is(tax_amount(0, [[2, 50]]), 0, 'Example 3');
+done_testing();
+
+sub tax_amount
+{
+     my ($income, $tax_aref) = @_;
+     my $tax_amount = 0;
+     my $marker = 0;
+     for my $slot ( @$tax_aref )
+     {
+          my $up_to = $slot->[0];
+          my $tax = $slot->[1]/100;
+          if ( $marker < $up_to )
+          {
+               if ( $income >= $up_to )
+               {
+                    $tax_amount += ($up_to - $marker) * $tax;
+                    $marker = $up_to;
+               }
+               elsif ( $income < $up_to )
+               {
+                    $tax_amount += ($income - $marker) * $tax;
+                    last;
+               }
+          }
+     }
+     return $tax_amount;
+}