self Maths Puzzle

A person has chosen his life insurance plan as follows. At age of 50 he get 20 lakhs. Next year he gets 1 lakh next year 20% less of 1 lakh, i.e 80000 next year 20% less of 80000 and so on.........
If he lives 100 years, What is the total amount that he gets finally.

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self Other Question

4+3=16
5-3=821
6+3=312
7-3=643
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i+k+w = a
u+w+r = i
e+g+h = ?