Indian Schools assign either percentages or grades, which you are supposed to send to colleges in the US.
You should never convert your percentage/grades to the 4 point GPA scale.
That said, even if you have 90+ scores across the board AND some mediocre ECs, your chances for UPenn are still slim, given that you are an international applicant. Also, do you need financial aid? If so, it is almost impossible.
@rathin You stats are obviously oK and you do have a chance but it is Penn and especially for international students from places like India and China it is beyond difficult. Applying ED will help a little bit too.