Simple interest for one quarter when $300 at 5 annual interest paid semiannually

How do the graphs of y = 1/x and y=5/x+6 compare?

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 expression gives the exact value of x?