Do you know how to calculate the floor area by floor area ratio? Please provide a formula! Plot ratio = building area △ floor area Building area = floor area × plot ratio Is this company right?

Floor area ratio = total building area (if there are differences in calculation, it shall be calculated according to the requirements of the Planning Bureau. Generally, the building area of the basement is not included, and a certain value of the storey height is calculated according to the second floor) / land use area (the total land use area of a project)
The understanding of floor area is different. The calculation formula is also different. My understanding should be right. I am an architect

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