Convert 6800 microseconds to centiseconds

Question and answers are in the attached picture. you so much in advance.

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

Which inequality has a dashed boundary line when graphed ?