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. Find the present worth of P1,000 today (2021) in the year 1990 if the inflation rate of 12% is constant through the years - If you invest P10,000 with a rate of interest of 12% compounded annually, compute the interest of your investment after 10 years if the inflation rate is 10% annually. A certain commodity has a present value of P15,000, find the future amount of the commodity after 3 years if the economic experiencing an inflation rate of 10% annually.