Compute bits per second

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We know a computer can code 1024 bits/sec using a RSA modulus of 1536 bits and the running time of modular exponential with modulus $n$ is $O(\ln^3(n))$.

Using a key of 2048 bits, how many bits per second will code that computer?

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You are told that the encryption rate decreases with a factor $\ln^3 n$, so compare $\ln^3 1536$ and $\ln^3 2048$