At the start of the year, Bottom Dollar Discounters had inventory worth $$199,400$ at retail. On December $31,$ the retail value of the inventory was $$320,100.$ If annual sales amounted to $$1,927,350,$ find the inventory turnover at retail for the year. $($Round your answer to the nearest tenth.$)$

a$.7\mathrm{.}4$ times

b$.8\mathrm{.}0$ times

c$.8\mathrm{.}9$ times

d$.9\mathrm{.}7$ times