#!/usr/bin/env python3

# -*- coding:utf-8 -*-

s1 = 72

s2 = 85

r = (s2 - s1) / s1 * 100

print(f'小明去年的成绩是：{s1}，今年的成绩是：{s2}，小明的成绩提升了：%.2f%%' % r)