2. The same amount of money, 22b =16a;
3.A=B+0.45
》》22B= 16(B+0.45)
》》22B= 16B+7.2
》6B=7.2
》》B= 1.2
》22B+ 16A = 22B+22B = 44B = 52.8;
Xiao Ming spent 80 points in 52 yuan.