The basic fee for the exam is $52, but it varies based on the country of the applicant. For Indian applicants, the fee for SAT comes out to be ~$106 (with written essay), or ~$94 (without essay).
In Indian Rupees, the SAT exam fee is around 6200-7000 INR.
Apart from the general SAT, one can sit for subject SATs which can be useful under certain circumstances. The fee for subject SATs comes out to be ~$111, though the importance of subject tests is gradually diminishing in general.