How would we compute the gross return 1 + R_t (k) over some time period k using log returns? In this case, what is the simple arithmetic mean of these gross returns? Is the average of this multiperiod correct (unbiased)? Assuming that (1 + R₁) = 1. 1111, (1 + R₂) = 1. 0500, and (1 + R₃) = 1. 0476, compute these returns. What is the formula for the geometric mean return?