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#!/usr/bin/perl -w
use strict;
...
print "10 => " . round_up_tens(10) . "\n";
print "14 => " . round_up_tens(14) . "\n";
print "144 => " . round_up_tens(144) . "\n";

-24 => -20
-14 => -10
...
10 => 10
14 => 20
144 => 150