As the financial leverage multiplier increases, this may result in an increase in the net profit margin and return on investment, due to the increase in interest expense as debt increases an increase in the net profit margin and return on investment, due to the decrease in interest expense as debt decreases a decrease in the net profit margin and return on investment, due to the increase in interest expense as debt increases a decrease in the net profit margin and return on investment, due to decrease in interest expense as debt decreases