total前面用什么介词

前面用介词in，例如：

1.In total， 45 per cent of ***s in Britain are exposed to tobacco smoke at home.英国总计有45%的成人在家里遭受到烟草烟雾的侵害。

2.The repairs came to over ￡ 500 in total.修理费总共500多英镑。

3.They finished their meal in total silence.他们默不作声地吃完饭。