Is an example of one of the most important minerals to industrialized economies.

The correct answer is iron.

Iron or iron ores are considered to be of critical use to almost everything in industrialized economies in fields such as energy, infrastructure, transportation uses and the creation of equipments or tools. Iron is made into steel, which is used as foundation for houses and large buildings. Which is why it is considered to play a vital role in industrialized economies.

1190 is your answer! the way you get it is 1400 - 15% =1190 : )