Assume that there is a bond that pays $$25\mathrm{.}00$ at the and of year $3,$ and $$130\mathrm{.}00$ at the end of year $7.$ It sells at a total $=$$$(25\mathrm{.}00+130\mathrm{.}00).$ The Macauley duration of the bond is$?$ Answer with two digits decimal accuracy.