1. **Stating the problem:** We need to find the sum of the following numbers: 480, 540, 250, 150, 350, 140, 300, 250, 290, 150, 120, 260, 40, 150, 330, 200, 730, 420, 850, 70, 350, 90, 130, 180, 180, 50, 260, 300, 450, 300, 230, 310. 2. **Formula used:** The sum of a list of numbers $a_1, a_2, ..., a_n$ is given by $$\sum_{i=1}^n a_i = a_1 + a_2 + ... + a_n$$ 3. **Calculation:** Adding all the numbers step-by-step: $$480 + 540 = 1020$$ $$1020 + 250 = 1270$$ $$1270 + 150 = 1420$$ $$1420 + 350 = 1770$$ $$1770 + 140 = 1910$$ $$1910 + 300 = 2210$$ $$2210 + 250 = 2460$$ $$2460 + 290 = 2750$$ $$2750 + 150 = 2900$$ $$2900 + 120 = 3020$$ $$3020 + 260 = 3280$$ $$3280 + 40 = 3320$$ $$3320 + 150 = 3470$$ $$3470 + 330 = 3800$$ $$3800 + 200 = 4000$$ $$4000 + 730 = 4730$$ $$4730 + 420 = 5150$$ $$5150 + 850 = 6000$$ $$6000 + 70 = 6070$$ $$6070 + 350 = 6420$$ $$6420 + 90 = 6510$$ $$6510 + 130 = 6640$$ $$6640 + 180 = 6820$$ $$6820 + 180 = 7000$$ $$7000 + 50 = 7050$$ $$7050 + 260 = 7310$$ $$7310 + 300 = 7610$$ $$7610 + 450 = 8060$$ $$8060 + 300 = 8360$$ $$8360 + 230 = 8590$$ $$8590 + 310 = 8900$$ 4. **Final answer:** The sum of all the numbers is **8900**.