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Teacher Zhang, a book in China ancient books database.

Solution: let teacher Zhang's monthly salary be X.

x- 1/2X- 1/8X- 1/5X-40 = 450

( 1- 1 \ 2- 1 \ 8- 1 \ 5)x-40 = 450

7\40x-40=450

7\40=490

x=490÷7\40

x=2800

A: Teacher Zhang earns 3920 yuan a month.