To find the percent of Chris's salary withheld for deductions, we need to divide the amount withheld by her gross salary and then multiply by 100 to convert to a percentage:
percent withheld = (amount withheld / gross salary) x 100
percent withheld = (6,500 / 20,550) x 100
percent withheld = 0.3162 x 100
percent withheld = 31.62
Therefore, the closest answer choice is (b) 31.61.