Michigan Supreme Court November 8, 1985, 72912, (Calendar No. 10) (City of Plymouth v. City of Detroit)

Brickley, J.

This breach of contract action involving a 1976 thirty-nine percent water rate increase levied by the City of Detroit on ninety-five municipal customers outside the city requires us to pass on the method of determining whether the rates in question are "reasonable in relation to the costs incurred” and to consider the appropriate burden of proof and the standard of review to be