Answer :
Given,
Principal = Rs.10000
Rate = 20%
Time = 2 year
Hence,
Compound interest = 
= 
If interest compounded half yearly ,
Rate = 
Time = 2×2 = 4 half years
Hence,
Compound interest = 
= 10000
So,
If Rakesh can earn = Rs.(4641 – 4400 ) = Rs.241 more
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