To calculate the hourly salary of the cashier after the 50% increase during weekends, you can follow these steps:
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First, determine 50% of the base salary: \[ 50% \text{ of } 12 = 0.50 \times 12 = 6 \text{ dollars} \]
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Next, add this amount to the base salary to find the weekend salary: \[ \text{Weekend Salary} = \text{Base Salary} + \text{Increase} = 12 + 6 = 18 \text{ dollars} \]
Thus, the hourly salary after the increase during weekends is $18.