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=-48,000+9000(P/A,i*,10)+(-2000(P/F,i*,10))

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

Any MARR value less than (Answer goes here) % favors Y.