1. **Stating the problem:** We are given a list of merchant numbers: 2, 3, 8, 16, 17, 19, 25, 27, 43, 45, 61, 73, 80. We need to find the sum of these numbers. 2. **Formula used:** The sum of a list of numbers is found by adding each number together: $$\text{Sum} = a_1 + a_2 + a_3 + \cdots + a_n$$ 3. **Calculating the sum:** $$2 + 3 = 5$$ $$5 + 8 = 13$$ $$13 + 16 = 29$$ $$29 + 17 = 46$$ $$46 + 19 = 65$$ $$65 + 25 = 90$$ $$90 + 27 = 117$$ $$117 + 43 = 160$$ $$160 + 45 = 205$$ $$205 + 61 = 266$$ $$266 + 73 = 339$$ $$339 + 80 = 419$$ 4. **Final answer:** The sum of the merchant numbers is **419**.