Eleven dollars per part at 12.5 million cars and trucks came to a total cost of $137 million to improve the safety.

给1250万辆轿车和卡车配上11美元的隔板,提高安全性，共需花费一亿三千七百万美元。

耶鲁公开课 - 公正课程节选

What do we mean by total cost?

总成本是什么意思呢

耶鲁公开课 - 博弈论课程节选