How to calculate the plot ratio of composite buildings?

1. We should first find out the actual plot ratio of the non-domestic part of the building. This will be **PRan** in the formula below.

2. We should then use the formula below to calculate the remaining plot ratio for the domestic part of the building, this will be **PRad**.

The plot ratio for the domestic part of a composite building shall not exceed the product of the difference between the permitted plot ratio for the building if it were a non-domestic building and the actual plot ratio of the non-domestic part of the building and the permitted plot ratio for the building if it were a domestic building divided by the permitted plot ratio for the building if it were a non-domestic building.

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