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Sum\ with\ Simple\ Interest=Rs 16, 000(1 + 5/100 * 3/2)=Rs 17, 200.\\\\Sum\ with\ compound\ interest=Rs16,000 (1+2.5/100)^3=Rs17,230.25\\\\Difference=Rs\ 30.25\\

Rate of interest for compound interest is  5/2%  for each of 6 months and there are 3 times when the interest is compounded in 1 1/2 years.