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TCS Other Question

a student calculated avg mark as 76 in 24 subjects. but he put 3 marks incorrectly by reversing the digits of the real mark.
the actual marks were 87.. 79.. and 76.
So the actual avg mark differed from the calculated avg mark by what %
options were:-
1)none of these
2) 2%
3) 8.2%

This qsn i got today in my apti..
the population of india increases at the rate of 7% annual.present population in 70.51lakhs.what is the population of india 3yrs before?
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