It's daylight robbery actually from everyone. Duty should be ideally charged only as per the actual value of goods in the invoice. Why should it be calculated on logistics+ insurance also. The buyer is anyways incurring those expenses which are external and not adding to the value of the item.This is beyond ridiculous.
Now that you mention it I did the Math and it works out to something like this:
Landed price = price + shipping + insurance
BCD @ 35% of landed price
GST @ 28% of landed price + BCD
Surcharge @ 10% of BCD
Daylight robbery charges by courier
Correct me if I'm incorrect.