A contractor must choose between buying or renting a crane for the duration of a 4 year construction project. The contractor uses an MARR of 8%. The crane costs $500,000 and can be sold for $350,000 after 4 years. The cost to operate and maintain the crane is $250,000 per year. Renting the crane costs $310,000 per year including all operating and maintenance costs. Determine the incremental benefit-cost ratio that the contractor should use to decide between buying and renting. Express your answer to two decimal places.

Answer is 0.91, just need the work shown.