Answer:
55%
Explanation:
You can tell by looking at your options, that the answer has to be above 50%. (297 > (.5 * 540))
After figuring this out, it is just a matter of trial and error.
540 * .51 (51% in decimals) = 275.4 X
540 * .52 = 280.8 X
540 * .53 = 286.2 X
540 * .54 = 291.6 X
540 * .55 = 297