Given, Amount borrowed by Rahim (P) = 1024000 with a time period (T) = 1 yr.
Also, Rate of interest (R) = 5% per annum compounded half-yearly.
Let Amount = A
Now, for interest compounded half-yearly
= 640 x 41 x 41
= Rs.1075840
Now, we know Compound interest,CI = Amount-Principle
⇒ CI = 1075840-1024000
= RS. 51840
Hence, interest paid by him is RS.51840.