The na+ -glucose symport system of intestinal epithelial cells couples the "downhill" transport of two na+ ions into the cell to the "uphill" transport of glucose, pumping glucose into the cell against its concentration gradient. if the na concentration outside the cell ([na+]out) is 159 mm and that inside the cell ([na+]in) is 17.0 mm, and the cell potential is -52.0 mv (inside negative), calculate the maximum ratio of [glucose]in to [glucose]out that could theoretically be produced if the energy coupling were 100% efficient. assume the temperature is 37c.