What is different between CGPI and CGPA in engineering (Mumbai University)? How do I convert both to percentage?

The cumulative grade percentile index can be converted into percentages using two formulas:

1. CGPI less than 7 can be calculated using the formula 7.1* CGPI + 12
2. CGPI greater than 7 can be calculated using the formula 7.4*CGPA +10

CGPA

The cumulative grade point average is an educational grading system mainly used in colleges and schools. The method to convert 7 point scale CGPA into a percentage is given below 

Initially, you need to convert the 7-point CGPA to a 10-point scale.

If a person has a 5.53 CGPA on 7 point scale CGPA then - (5.53 * 10)/7 = 7.9, which is a 10-point scale CGPA

Now calculate the percentage - 7.9 CGPA * 9.3 (standard number used by companies that come for placements) = 73.47%