Verify that your worksheet matches the example in the text. Check your worksheet by changing the discount rate to 10%. The net present value should now be between $56,400 and $56,535depending on the precision of the calculations. If you do not get an answer in this range, find the errors in your worksheet and correct them. If you did not use formulas to calculate the Discount Factors, be sure that those values are updated appropriately using the Appendix 7B formulas that are also noted at the bottom of the spreadsheet instead of using the Discount Factor tables