How do I set this problem up? I keep getting the wrong answer in my scientific calculator

12) A simplified economy is based on agriculture, manufacturing, and transportation. Each unit of agricultural output requires 0.3 unit of its own output, 0.5 of manufacturing, and 0.2 unit of transportation output. Each unit of manufacturing output requires 0.3 unit of its own output, 0.1 of agricultural, and 0.4 unit of transportation output. Each unit of transportation output requires 0.4 unit of its own output, 0.2 of agricultural, and 0.1 of manufacturing output. There is demand for 95 units of agricultural, 90 units of manufacturing, and 80 units of transportation output. How many units should each segment of the economy produce? A) Agriculture: 555; manufacturing: 390; transportation: 440 B) Agriculture: 440; manufacturing: 555; transportation: 390 C) Agriculture: 390; manufacturing: 440; transportation: 555 D) Agriculture: 555; manufacturing: 440; transportation: 390