As you asking for amount of Demand draft for appear in IIT JEE exam, so on yoru demand I am telling same here :

Category GEN, OBCNCL SC, ST, PwD
Total fee for the autumn semester Rs. 1,22,876/ Rs. 22,876/
(less) Fee paid at the time of seat acceptance Rs. 44,000/# Rs. 19,000/#
Fee due to be paid Rs. 78,876/ Rs. 3,876/

Mode of payment: demand draft drawn in favor of Registrar, IIT Bombay, payable at Mumbai

# Rs. 1,000/-deducted towards processing fee for document verification re i centre.

Key dates and direction related to exam
Date and time for reaching at IIT Bombay (Preferable) By afternoon of 20th delay in reporting. July, 2016 to avoid any

Date and time for registration Thursday 21st July 2016, 8:30 AM

Date and time for orientation Thursday 21st July 2016, 9.00 AM

Venue for candidates Convocation Hall

Venue for accompanying persons (parents / guardians) Lecture Hall
Complex, (L3) (Halls 1 to 4) [Live telecast of Orientation programme)

Deadline for registration Thursday 21st July 2016, 3:00 PM

If you CANNOT report in person You may authorize your parent / guardian to
complete registration on your behalf; do not forget to send authorization letter.

If you do NOT register It will be presumed that you are NOT interested in
taking admission at IIT Bombay

Registration material and other information Will be provided at the venue of
registration

Instructions [classes] begin from Monday 25th July 2016

Savings bank account @ Canara Bank Account opening forms will be provided.
Carry two (2) passport size photographs

Address

Indian Institute of Technology Bombay
IIT Area, Powai
Mumbai, Maharashtra 400076