Answer:
Conservative approach  $  158,760
Aggresive approach     $  150,675
Explanation:
total financing needs:
490,000 + 390,000 + 590,000 = 1470000
Conservative approach
long term financing: 70% of the needs at 12%
1029000 x 0.12 = 123480
remaining 30% financed with short-term at 8%
441,000 x 0.08 = 35280
Total interest expense  158760
Aggresive approach
long term financing: 56.25% of the needs at 12%
826,875  x  0.12  =  99,225
remaining 43.75% financed with short-term at 8%
643,125  x  0.08  =  51,450
Total interest expense  $  150,675