Two roadway designs are under consideration for access to a permanent suspension bridge. Design 1A will cost $2.5 million to build and $100,000 per year to maintain. Design 1B will cost $3.4 million to build and $40,000 per year to maintain. Both designs are assumed to be permanent. Use an AW-based rate of return equation to determine (a) the breakeven ROR and (b) which design is preferred at an MARR of 30% per year.

a) The breakeven ROR is ( WHAT IS THE ANSWER ? ) %.

b) At an MARR of 30% per year, design (Click to select) ( 1B ) OR ( 1A ) is preferred.