Comparative: Its price is twice as much as your competitor is.

[Englishnow]

Can I also say:

Its price is twice as much as your competitor is.

Or must I just say:

Its price is twice more expensive than its competitor.

?

Thanks in advance.

[Mister Micawber]

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Neither is good. It is twice as expensive as its competitor.
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Native English teacher at Mister Micawber's

[Englishnow]

Thanks.