Can I use by in this sentence?

1

Is the sentence below correct? Is it okay to use "by" in English?Simms Engineering estimates that the proposed modifications by your original design will cost in the region of $200,000.

Simms asked Jun 22 '13 at 08:47 Chang New member

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Dear Sir, 

 

Pls advice how can emprove english every i'm remeber 10 world meaning but next day i forgat all tthose. 

 

Pls advice 

link comment answered Jun 22 '13 at 12:38 umesh New member

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