A national company engaged in the manufacture of air-conditioners offers three basic products in terms of comparative prices-low, medium, and high. Past records show that the percentage sales in three categories are 45, 30, and 25, respectively. A sales promotion was conducted highlighting the advantages of high-priced air-conditioners. After the promotion, a random sample of 100 air-conditioners showed that the number of items sold in the low, medium, and high priced items are 30, 30, and 40, respectively. Test the hypothesis that the current pattern of sales does not differ from the historical pattern. Use a 1% level of significance.

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