Divide 45 by 100 to revert it into a percentile. Then multiply it by 200. Or you could do the simpler version of simply doubling the number...
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90 ! .45 * 200 = 90
The answer is 200% because 100% of 45=45 and 90 is two times 45 therefore it is 200%.
200 (200*45)/360 = 25
45/1000 or 9/200
90/200 = 0.45 = 45%