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উত্তর:
5/9
The salesman's commission for the month is 5/4 * 8000 = 10000.Therefore, his total income for the month is 8000 + 10000 = 18000.The fraction of his income that came from commission is:10000 / 18000 = 5/9.So, 5/9 of his income for the month came from commission.