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The units of Manganese Plus available for sale during the year were as follows:

Mar. $1$ Inventory $20$ units @ $$31$ $$620$

June $16$ Purchase $31$ units @ $$30930$

Nov. $28$ Purchase $39$ units @ $$351,365$

$90$ units $$2,915$

There are $13$ units of the product in the physical inventory at November $30.$ The periodic inventory system is used.

a$.$ Determine the inventory cost by the FIFO method.

$fill in the blank $1$

b$.$ Determine the inventory cost by the LIFO method.

$fill in the blank $2$

c$.$ Determine the inventory cost by the weighted average cost methods. Round intermediate calculations and final answer to two decimal places.