Bramble Corp. just began business and made the following four inventory purchases in June:

June 1		147 units		$1020
June 10		196 units		1530
June 15		196 units		1650
June 28		147 units		1290
				$5490

A physical count of merchandise inventory on June 30 reveals that there are 210 units on hand. The inventory method which results in the highest gross profit for June is

a) not determinable

b) the FIFO method

c) the average cost method

d) the LIFO method