A Residential Building Contractor Borrowed $30,000 to Complete a New

A residential building contractor borrowed $30,000 to complete a new home. Some of the money was borrowed at 5%, some at 6%, and some at 8%. How much was borrowed at each rate if the annual interest owed was $1780 and the amount borrowed at 6% is four times more than the amount borrowed at 8%?

A) $8000 at 5%; $18,000 at 6%; $4000 at 8%
B) $10,000 at 5%; $16,000 at 6%; $4000 at 8%
C) $9000 at 5%; $14,000 at 6%; $6000 at 8%
D) $8000 at 5%; $17,000 at 6%; $5000 at 8%
E) $7000 at 5%; $20,000 at 6%; $5000 at 8%