Question

The average number of books sold by Viren in first 4 months is 3200 and in first 5 months is 4300. If the number of books sold by him in 6th month is 20% less than that in 5th month, then find the total number of books sold in the sixth month.

A 6660
B 4290
C 6960
D 5590
E 5460
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