Silva SA's record of transactions concerning part X for the month of April was as follows.

Instructions
a. Compute the inventory at April 30 on each of the following bases. Assume that perpetual inventory records are kept in units only. (Carry unit costs to the nearest cent.)
1. Specific identification; ending inventory is comprised of 100 units from beginning inventory and 250 units from the April 26 purchase.
2. First-in, first-out (FIFO).
3. Average-cost.
b. If the perpetual inventory record is kept in dollars, and costs are computed at the time of each withdrawal, what amount would be shown as ending inventory in 1, 2, and 3 above? (Carry average unit costs to four decimal places.)