In the year ended February $2,2019,$ Madi's reported cost of goods sold $($before shrinkage$)$ of $$16\mathrm{.}7$ billion; February $2,2019,$ inventory of $$7\mathrm{.}0$ billion; and ending inventory for the previous year $($February $3,2018)$ of $$6\mathrm{.}6$ billion.

Required:

If the cost of inventory purchases was $$17\mathrm{.}6$ billion, what was the cost of shrinkage during the year ended February $2,2019?($Enter your answer in billions rounded to $1$ decimal place.$)$