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The reaction of hydrogen peroxide with iodine, H2O2(aq) + I2(aq) ⇌ OH^-9(aq) + HIO (aq) is first order in H2O and first order in I2. If the concentration of H2O was increased by half and the concentration of I2 was increased by four, by what factor would the reaction rate increase? Express your answer numerically.