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In the following table, information regarding publishing books by different publishers has been given. Study the table carefully and answer the questions.
If the total number of books published by publishers P, Q and R is increased by 30% and the total number of books published by remaining publishers be decreased by 20%, what will be the new average of books published by all the publishers?
Total books published by P, Q & R = 31200 + 33800 + 35700 = 100700
Books are increased by 30%
=> Number of books published by P, Q & R = $$100700 + \frac{30}{100} * 100700 = 130910$$
Similarly, books published by remaining publishers
= $$(28200 + 32200 + 29700 + 37800) * \frac{80}{100} = 102320$$
$$\therefore$$ Required Average = $$\frac{130910 + 102320}{7} = 33318$$
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