James owns a garment shop. He sold a total of 4 dresses at an average price of \$8. The next day, he again sold 4 dresses, but this time with an average price of \$10. On the third day, he sold 2 dresses after increasing the price by 10% and then 2 dresses after increasing the price by 20%. The dress before the increase of 10% had the same price as the average price of each dress on the first day, and the dress before the increase of 20% had the same price as the average price of each dress on the second day. What was the average price of all the dresses he sold?

The first day's sales totaled 4 times 8, which is 32 dollars, and the second day's sales totaled 4 times 10, which is 40 dollars. On the third day, he sold 2 dresses at a 10 percent increase over 8 dollars, making them 8.80 dollars each for a total of 17.60 dollars, and 2 dresses at a 20 percent increase over 10 dollars, making them 12 dollars each for a total of 24 dollars. The combined total for all 12 dresses is 32 + 40 + 17.60 + 24 = 113.60 dollars. Applying the basic average formula gives 113.60 / 12, which equals $9.47.

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