Indexed cost

1. I agree with Pravin Ji. Sale of rural agricultural land will be exempt from payment of tax. 
2. However, the sale of urban agricultural land will be taxable under sec 45 and no option to pay tax @ 10% without indexation benefit. 
3. Indexed COA shall be deducted from sale consideration and arrive at Long term capital gains which will be chargeable to tax @ 20%. 
Please correct me if the above solution has an alternative view.