Can I use by in this sentence?


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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