Use the information to answer this question

Date.............Details........................
Feb........1 Purchased 400 units at N1.00 each
,, ........5 Purchased 200 units at N2.00 each
,,.........10 Purchased 200 units at N300 each
,, .........15 Issued 320 units
,,..........20 Issued 200 units at N4,00 each
,,..........25 Issued 120 units

Using the periodic simple average method, the cost per unit is