Boston has saved $28 million in debt service because of rating upgrades on its 10 borrowings since 1985, says a report released this month by the city's collector-treasurer.

"These savings mean that the city can provide more and better services for the same level of tax support," says the report, authored by Lee F. Jackson, the collector-treasurer. "The city also saved a total of $129.5 million in interest costs by obtaining federal insurance for the bonds issued to finance the new Boston City Hospital."

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