关于Python初学者（大一）的题

n = int(input('请输入购买数量：'))
price = 50
total = n * price
if n == 2:
    total = total * 0.9
elif n == 3:
    total = total * 0.8
elif n >= 4:
    total = total * 0.6
print("应付金额：%.2f" % total)