local STATE = { cal = { hitCount = 10, missCount = 5, recent = {1,0,1,1} } }
local function RecentRate()
  local Cal = STATE.cal
  if not Cal then return 0, 0, 0 end
  local Hits = Cal.hitCount or 0
  local Total = Hits + (Cal.missCount or 0)
  local Recent = Cal.recent or {}
  local Sum = 0
  for _, Value in ipairs(Recent) do Sum += Value end
  local Percent = #Recent > 0 and math.floor(Sum / #Recent * 100) or 0
  return Hits, Total, Percent
end
local Hits, Total, Percent = RecentRate()
print(Hits, Total, Percent)
print(string.format("hit rate %d/%d   recent %d%%", Hits, Total, Percent))