Which expression is equivalent to r + 3/x^2 - 2x - 3 / x^2 + 2r - 3/x + 1 if no denominator equals zero?

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.