Know that the actual area of the house is 136 square meters, if 70% of the housing rate to calculate the building area should be how much? This formula is how to calculate

Know that the actual area of the house is 136 square meters, if 70% of the housing rate to calculate the building area should be how much? This formula is how to calculate

Actual area = usable area = building area × occupancy rate
Then the building area = actual area / occupancy rate
The building area of this house is 136 △ 70% = 194.29 square meters