Pick at least two variables in the spreadsheet of Turkish airlines to "flex" by 5% up and down (for variables that cover more than one year please remember to change all years). Move these variables up 5% and recorded the new net present value. Take the difference between the new net present value and the original net present value and divide by the original net present value to get the percentage change in net present value. Record what you changed and the percentage change in net present value.