r = 100 * (s2 - s1)/s1
print('小明成绩提升了', '%.1f%%'%r)
s1=72
s2=85
grade=(s2-s1)/s1*100
print("小明的分数提升了{0:.2f}%%".format(grade))
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TN
r = 100 * (s2 - s1)/s1
print('小明成绩提升了', '%.1f%%'%r)