I have one product which is the cost of $99.95
List Price - $99.95
Price - $69.95
You Save - $30.00
Discount - 30%
Now i want to adjust delivery type first i have given
First Option - Retail Box (+$45)
Second Option - Email Delivery (-15%) of the original price
So that mean on if customer choose retail box they have to paid $45 and get 30% discount and if they choose email delivery they only get 15% discount.
Sometime misunderstanding with this question, but i hope you define correctly. Please help 
I am not sure what you are asking but I am confused by the discount percentages you provided.
I set up a test item as follows:
List price: $99.95
Price: $69.95
The $30 discount amounts to a 30% discount.
Using a “Retail box” option with a +$45 charge, I get the following:
List price: $144.95
Price: $114.95
The $30 discount amount to a 21% discount
Using an “Email delivery” option with a -15%, I get the following:
List price: $89.46
Price: $59.46
The $30 discount amount to a 34% discount
Was your concern that there was a lower percentage discount on the email delivery then on the retail box. If so, you need to recheck your numbers. Or are you trying to maintain a 30% discount across delivery options?
Bob
That was the totally problem i am getting.
Yeah i want to give 15% discount on email delivery and 30% discount on retail box delivery
It is very unclear what you are saying. Do you mean that you want to give an additional 15% off for the email delivery? I can’t imagine paying more for electronic distribution of an item than I would for the physical good.
What do you want the retail box to cost delivered? $114.95 ($69.95+45)?
Do you then want the email delivery to be 15% less than this?
Bob
Actually company was giving me 50% discount on that item only on physical shipment and on emal delivery they giving me 25% discount.
What do you want the retail box to cost delivered? $114.95 ($69.95+45)?
Yes.
Do you then want the email delivery to be 15% less than this?
Yes, i think so
If you want the price for the email version to be 15% lower than the retail version, you can do the following:
Email delivery price = $114.95*.85 = $97.71
Email option = $97.71-69.95 = $27.76
Bob