Investment manage

Main features
・Display the following for each business operator and for each designated period
　- Operating balance
　- Total interest
　- Average yield
　- Average operating balance
　- Monthly average interest
・Input and withdrawal
　- Investment (Investment)
　- Dividend (principal)
　- Dividend (interest)
　- Withholding tax
・For detailed explanation, see "How to use" on the setting screen.