If the compound interest on a certain sum for two years at 12(1/2) % p.a. is 4080, the simple interest on the same sum at the same rate of interest for the same period of time is
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If the compound interest on a certain sum for two years at 12(1/2) % p.a. is 4080, the simple interest on the same sum at the same rate of interest for the same period of time is