1. **Stating the problem:** We have a sequence $(u_n)$ with terms $U_0, U_1, U_2, U_3, U_4$, and we want to understand the sum $12 (U_0 + U_1 + U_2 + U_3 + U_4)$ which represents the total salary over a period. 2. **Formula used:** The sum of the first $n+1$ terms of a sequence is given by $$S_n = U_0 + U_1 + U_2 + \cdots + U_n.$$ Here, $n=4$, so $$S_4 = U_0 + U_1 + U_2 + U_3 + U_4.$$ The total salary is then $$12 \times S_4 = 12 (U_0 + U_1 + U_2 + U_3 + U_4).$$ 3. **Explanation:** This formula means we sum the first 5 terms of the sequence and multiply by 12, possibly representing 12 months in a year. 4. **Intermediate work:** Without explicit values or a formula for $U_n$, we cannot simplify further. If $U_n$ follows a known pattern (e.g., arithmetic or geometric), we could find $S_4$ explicitly. 5. **Summary:** To find the total salary over the period, sum the first 5 terms of the sequence and multiply by 12. Final answer: $$\boxed{12 (U_0 + U_1 + U_2 + U_3 + U_4)}.$$