1()

()
89.61~9615

0-59
60-69
70-79
80-89
90-100







0
1
2
3
4

= *(1+)
3. ()
4. ()(+5%)(+15%)(+25%)

(20%)
1211 1012121 2 1.5 1.5 1 (12+11*2+10*1.5+12*1.5+12*1)÷7=11.29
()0.885.5085.50*0.8=70.80

()
97

()
97