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package Spreadsheet::Engine::Function::SYD; |
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use strict; |
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use warnings; |
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use base 'Spreadsheet::Engine::Fn::depreciation'; |
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sub signature { 'n', 'n', '>=1', '>=0' } |
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sub calculate { |
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my ($self, $cost, $salvage, $lifetime, $period) = @_; |
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return ($cost - $salvage) * ($lifetime - $period + 1) / |
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((($lifetime + 1) * $lifetime) / 2); |
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} |
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1; |
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__END__ |