Ononot — A store has three branches. Branch 1 has 10 employees with a

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A store has three branches. Branch 1 has 10 employees with a mean salary of $\$ 40,000 $. Branch 2 has 15 employees with a mean salary of$ $50,000 $. Branch 3 has$ N_3 $employees with a mean salary of$ $60,000 $. If the combined mean salary of all three branches is$ $51,250 $, what is the number of employees$ N_3$ in Branch 3?