Question

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 is decreased by 20%, what will be the new average of books published by all the publishers?

• A. 33418
• B. 33318
• C. 32518
• D. 33618
• E. None of these

Answer 1

The correct option is B

33318

Total books published by Publishers P, Q and R $=(31200+33800+35700)\times \frac{130}{100}=100700\times \frac{130}{100}=130910$
Total books published by Publishers M, N, O and S $=(28200+32200+29700+37800)\times \frac{80}{100}=127900\times \frac{80}{100}=102320$
New average of books published $=\frac{130910+102320}{7}\approx 33318$