筆記一下，或許可以達成運算功能的模組使用

https://www.drupal.org/project/webform

https://www.drupal.org/project/webform_optionsmarkup

https://www.drupal.org/project/webform_table_element

https://www.drupal.org/project/views_aggregator

http://flink.com.au/tips-tricks/thats-easy-drupal-isnt-it