Use the experience multiplier to multiply by the skill experience points for the final skill percentage (%) gain. Add that to the skill.

Skill Level	Experience Multiplier		Skill Level	Experience Multiplier		Skill Level	Experience Multiplier		Skill Level	Experience Multiplier
100%	0		75%	0.25		50%	0.5		25%	0.75
99%	0.01		74%	0.26		49%	0.51		24%	0.76
98%	0.02		73%	0.27		48%	0.52		23%	0.77
97%	0.03		72%	0.28		47%	0.53		22%	0.78
96%	0.04		71%	0.29		46%	0.54		21%	0.79
95%	0.05		70%	0.3		45%	0.55		20%	0.8
94%	0.06		69%	0.31		44%	0.56		19%	0.81
93%	0.07		68%	0.32		43%	0.57		18%	0.82
92%	0.08		67%	0.33		42%	0.58		17%	0.83
91%	0.09		66%	0.34		41%	0.59		16%	0.84
90%	0.1		65%	0.35		40%	0.6		15%	0.85
89%	0.11		64%	0.36		39%	0.61		14%	0.86
88%	0.12		63%	0.37		38%	0.62		13%	0.87
87%	0.13		62%	0.38		37%	0.63		12%	0.88
86%	0.14		61%	0.39		36%	0.64		11%	0.89
85%	0.15		60%	0.4		35%	0.65		10%	0.9
84%	0.16		59%	0.41		34%	0.66		9%	0.91
83%	0.17		58%	0.42		33%	0.67		8%	0.92
82%	0.18		57%	0.43		32%	0.68		7%	0.93
81%	0.19		56%	0.44		31%	0.69		6%	0.94
80%	0.2		55%	0.45		30%	0.7		5%	0.95
79%	0.21		54%	0.46		29%	0.71		4%	0.96
78%	0.22		53%	0.47		28%	0.72		3%	0.97
77%	0.23		52%	0.48		27%	0.73		2%	0.98
76%	0.24		51%	0.49		26%	0.74		1%	0.99