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Verified Answer :

Azieq

book sold = 1 000 000
1000000 × 40% = 400 000

The 55 year olds  bought 40% of the book.

40% of 1 000 000.

= (40 / 100)   1 000 000

= 0.4
1 000 000

= 400 000

They bought four hundred thousand books.

I hope this explains it.