Answer:
40% gain.
Explanation:
Suppose he bought 100 fruit at a cost of $40.
He sold 1/2 ($20 ) for 20 * 1.6 = $32.
He sold 1/4 ($10) for 10*1.2 = $24.
Total revenue = $56 dollars so he made 56 - 40 = $16 profit.
percent gain = 16 * 100 / 40
= 40 %.
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