#6) A 2000-gallon metal tank to hold hazardous materials cost $200,000 when it was fabricated 15 years ago. What would a 5,000-gallon tank cost today if the power-sizing exponent is 0.575 and the construction cost index for such facilities has increased from 120 to 400 over the last 15 years? a. $337,175 b. $666,667 c. $1,123,917 d. $200,000