solve please !!

[sanjana26]

a country accumulates 100 crore @ 10 cr per year, another 100cr @ 20 cr per year
and another 100 cr @ 25 cr per year.
what is the average rate of accumulation?

[Sumit]

Average rate of accumulation=Total Accumlation/Total time taken
                                       =(100+100+100)/(10+5+4)
                                       =300/19=15.79cr (approx) per year..

[sanjana26]

Thanku so much sumit..
 can u tell me how can we solve it using harmonic mean ? :)

[sanjana26]

please try this question I am using geometric mean but my answer is not coming correct

an economy grows@2% in first year ,2.5% in 2nd yr ,3% in 3rd yr ..4% in fourth yr..
.......10% in tenth year . What is the average rate of growth of the economy ?