Tax Rates on Trading Commodities etc., ???

all type of Incomes you mentioned will be taxed at Normal rate applicable to company ie 30% even profit on trading of shares listed will also be taxed @ 30%. (Sec 111A & 10(38) will not be applicable, because such shares are not Capital Asset.

However, in case of Profit on sale of Investemnt, there may be application of Sec 111A (in case of short term Capital gain on sale of listed shares, the same will taxed @ 15%) or Sec 10(38) (in case of Long term Cpaital Gain on sale of Shares listed, the same will be exempt).

Income taxable at slab rates in all cases.

However

1. Profit on Currencies - Non speculation business income

2. Profit on Futures in shares - Non speuclation business income

3. Profit on Commodities - Speculative Business income.