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YX4−1=−0.05\sqrt[4]{\frac YX}-1=-0.054XY−1=−0.05
0.93(1+p)(1+q)(1+r)=(0.95)40.93(1+p)(1+q)(1+r)=(0.95)^40.93(1+p)(1+q)(1+r)=(0.95)4