Actually anything above 60% in the indian system is considered is considered as 4/4 GPA in the american system.Therefore a percentage of 50% is a GPA of 3/4.
Check out this link in the information under GPA and indian grading.
You can also validate this information in iWES GPA calculator.Just enter your course as B.tech and your B.Tech percentage as 60%.It will give a result of 4/4 GPA
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