Liu Feng Wei Zi real estate company

Total area of the proposed house: 20+ 16+ 12+48=96.

There are 3 people in the public area, each with 48/3= 16.

Wang Fei area: 20+ 16=36.

Li Gang area: 16+ 16=32.

Liu Feng area: 12+ 16=28.

The property management fee shared by each person is as follows:

Wang Fei: 36/96* 144=54 yuan management fee.

Li Gang: 32/96* 144=48 yuan management fee.

Liu Feng: 28/96* 144=42 yuan management fee.