Ruxana Meer had following income and eligible investmented for 2020-2021 income year: 500000 from royalty, 5000 from Bank's saving account, 20000 taka share of income from partner and 30000 from spouse. She bought a laptop for 100,000. How should she classify each income? What is her total taxable income and rebate including double taxation? What is her tax liability after rebate?