Section 842. Computation of county equalization rates

The state board shall
  compute county equalization rates for each county to which this title is
  applicable  by  furnishing  the final state equalization rates which are
  established pursuant to article twelve of this chapter for each city and
  town in the county for the final assessment roll  to  be  completed  and
  filed  during  the current year or, if such rates are not then available
  for each city and town in the  county,  by  adjusting  the  final  state
  equalization rate established pursuant to article twelve of this chapter
  for  each  city  and  town  in  the county for the final assessment roll
  required to be completed and filed during the prior calendar year by the
  appropriate "change in level of assessment", if any,  as  that  term  is
  defined  in  section twelve hundred twenty of this chapter. On or before
  the fifteenth day of November, or such other date as may  be  prescribed
  by  law  for  the  determination of county equalization rates, the state
  board shall certify the county equalization rates to the  clerk  of  the
  legislative  body  of  each  county  to  which this title is applicable.
  Within five days of  the  receipt  of  such  rates,  the  clerk  of  the
  legislative body shall provide to each city and town a written notice of
  the county equalization rates computed by the state board.