
"It's" is invariably a short form of "it is." That contraction happens to have the same pronunciation as the possessive pronoun "its," which must not have an apostrophe. Also, "plunged" is misspelled.
The British pound has plunged to its lowest level since 1985.

Since the author hasn't responded for some considerable time, I have made the correction.
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This sentence is original and was not derived from translation.
added by al_ex_an_der, June 30, 2016
edited by al_ex_an_der, June 30, 2016
edited by PaulP, February 27, 2018
linked by PaulP, February 27, 2018