Donation limit and exemption

@ Suresh..

Your total income say... 45 lakhs...

Your adjusted total income (for calculation of 80G) would be around... 40 lakhs...

If trust comes under 50% donation category with 10% of adjusted total income.... 

Your maximum 80G claim cannot exceed Rs. 2 lakhs..

The amount need to be paid by cheque to trust with some formalities  specified in IT act..

It is beyond your understanding...