7. If you plan to have $4,000,000 when you retire, how long will you be able to withdraw $500,000 per year if the account earns interest at a rate of 6% per year? (Hint: Use interpolation) 8. Corrosion problems -and manufacturing defects rendered a gasoline pipeline between El Paso and Phoenix subject to longitudinal weld seam failures. Therefore, the pressure was reduced to 80% of the de sign value. If the reduced pressure results in delivery of S100,000 per month less product, what will be the value of the lost revenue after a 3-year period at an interest rate of 11.940397% per year, compounded continuously