**Wages Calculation under Halsey Premium Plan**

Under the Halsey premium plan, wages are calculated based on the time saved by workers in completing a task. This plan aims to incentivize workers to increase their efficiency and productivity. Here is how the wages are calculated under the Halsey premium plan:

1. **Time Allowed**: The first step in calculating wages under the Halsey premium plan is to determine the time allowed for completing a specific task. This time allowance is usually set by the management based on the average time taken by skilled workers to complete the task.

2. **Standard Time**: The standard time represents the time required to complete a specific task as per the predetermined standards. It is calculated by multiplying the time allowed by a predetermined efficiency factor, usually 100%.

3. **Time Saved**: The next step is to calculate the time saved by the worker in completing the task. This is determined by subtracting the actual time taken by the worker from the standard time.

4. **Halsey Premium**: The Halsey premium is a predetermined percentage of the time saved. It is usually set at 30% of the time saved. This premium serves as an incentive for workers to complete tasks in less time and increase their productivity.

5. **Wage Calculation**: The final step is to calculate the wages of the worker. The wages are determined by adding the Halsey premium to the product of the time saved and the hourly rate of the worker.

**Wages Calculation under Rowan Premium Plan**

Under the Rowan premium plan, wages are calculated based on the percentage of time saved by workers in completing a task. This plan also aims to incentivize workers to increase their efficiency and productivity. Here is how the wages are calculated under the Rowan premium plan:

1. **Time Allowed**: Similar to the Halsey premium plan, the time allowed for completing a specific task is determined by the management.

2. **Standard Time**: The standard time represents the time required to complete a specific task as per the predetermined standards. It is calculated in the same way as in the Halsey premium plan.

3. **Time Saved**: The time saved by the worker in completing the task is calculated by subtracting the actual time taken by the worker from the standard time.

4. **Rowan Premium**: The Rowan premium is a percentage of the time saved. However, unlike the Halsey premium plan, the percentage is calculated by dividing the time saved by the standard time and then multiplying it by the predetermined premium rate. This premium also serves as an incentive for workers to complete tasks in less time and increase their productivity.

5. **Wage Calculation**: The wages of the worker are determined by adding the Rowan premium to the product of the time saved and the hourly rate of the worker.

In conclusion, both the Halsey premium plan and the Rowan premium plan provide incentives for workers to increase their efficiency and productivity. While the Halsey premium plan offers a fixed percentage premium on the time saved, the Rowan premium plan offers a percentage premium based on the ratio of time saved to the standard time.