The PW-based relation for the incremental cash flow series to find i* between the lower first-cost alternative X and alternative Y has been developed.

0 = -50,000 + 9000(P/A,i*,10) + ( -1000(P/F,i*,10))0 = -50,000 + 9000(P/A,i*,10) + -1000(P/F,i*,10)

Determine the highest MARR value for which Y is preferred over X.

Any MARR value greater than % favors Y.