Can Indian businesses deduct expenses from income? That would solve the investment tax problem.
With this new clause, the calculation will be: income = $100 (investment) + $60 (revenue) = $160. Expenses = $100, profit = $60, and you'll pay tax.
It's like taking a loan from the bank and being taxed on the money as income. You still have to pay the whole thing back! (Effectively, any equity investment is a "liability" on the books; any investor will demand return on his whole investment, not just the portion that wasn't paid as tax)