Gonzalez Manufacturing borrowed $30000. Part of the money was borrowed at 14%, part at 16%, and part at 18%. The annual interest was $4880, and the total amount borrowed at 14% and 16% was twice the amount borrowed at 18%. Use Gaussian elimination or Gauss-Jordan elimination to find the amount borrowed at each rate.
How much money was borrowed at 14%, 16% and 18%?