0 A mathematical model for world population growth over short intervals is given by P = Poet, where Po is the population at time t = 0, r is the continuous compound rate of growth, t is the time in years, and P is the population at time t. How long will it take the world population to quadruple if it continues to grow at its current continuous compound rate of 1.88% per year? Substitute the given values into the equation for the population. Express the population at time t as a function of Po. (Simplify your answers.)

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