1. The problem is to find the sum of the numbers: 2,400,000, 1,800,000, 1,800,000, 1,500,000, 1,200,000, and 900,000. 2. The formula for the sum of numbers is simply adding them all together: $$\text{Sum} = a_1 + a_2 + a_3 + \cdots + a_n$$ 3. Add the numbers step-by-step: $$2,400,000 + 1,800,000 = 4,200,000$$ $$4,200,000 + 1,800,000 = 6,000,000$$ $$6,000,000 + 1,500,000 = 7,500,000$$ $$7,500,000 + 1,200,000 = 8,700,000$$ $$8,700,000 + 900,000 = 9,600,000$$ 4. Therefore, the total sum is: $$\boxed{9,600,000}$$ This means if you add all the given numbers, the result is 9,600,000.