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Mathematics of stock problem
Solution: Total expenditure at the time of purchase = 2000×14.8× (1+1.5 ‰) = 29,644.4 yuan.

When all are sold, the price per share =14.8+1+1.2-1+2-1=17 yuan.

After all of them are sold, the income after deducting the handling fee and transaction tax is 2000×17× (1-1.5 ‰-1‰) = 33915 yuan.

After all of them are sold, the money earned is = 339 15-29644.4 = 4270.6 yuan.

A: If he sells all the stocks before Friday's close, he will earn 4,270.6 yuan.