Im trying to figure out part B

Problem 11-5 (algorithmic) Question Help Consider these two alternatives. Alternative 1 Altemative 2 Capital investment $4.000 $6.400 Annual revenues $1,600 $1,850 Annual expenses $380 $500 Estimated market value $750 $ 1.200 Useful life 7 years 12 years a. Suppose that the capital investment of Alternative 1 is known with certainty By how much would the estimate of capital investment for Alternative 2 have to vary so that the initial decision based on these data would be reversed? The annual MARR is 15% per year. b. Determine the life of Alternative 1 for which the AWs are equal Click the icon to view the interest and annuity table for discrete compounding when the MARR is 15% per year. a. The capital investment of Alternative 2 would have to be $ 5780 or less for the initial decision to be reversed. (Round to the nearest dollar) b. The life of Alternative 1 for which the AWs are equal is years. (Round to one decimal place.) Problem 11-5 (algorithmic) Question Help Consider these two alternatives. Alternative 1 Altemative 2 Capital investment $4.000 $6.400 Annual revenues $1,600 $1,850 Annual expenses $380 $500 Estimated market value $750 $ 1.200 Useful life 7 years 12 years a. Suppose that the capital investment of Alternative 1 is known with certainty By how much would the estimate of capital investment for Alternative 2 have to vary so that the initial decision based on these data would be reversed? The annual MARR is 15% per year. b. Determine the life of Alternative 1 for which the AWs are equal Click the icon to view the interest and annuity table for discrete compounding when the MARR is 15% per year. a. The capital investment of Alternative 2 would have to be $ 5780 or less for the initial decision to be reversed. (Round to the nearest dollar) b. The life of Alternative 1 for which the AWs are equal is years. (Round to one decimal place.)