Property tax calculator for Daepyong building

propertytax.py

HOUSE_TAX_TABLE = ((60, 1), (90, 1.5), (150, 2.5), (float('inf'), 4.0))
RESOURCE_TAX_TABLE = ((6, 0.4), (7, 0.5), (13, 0.6), (13, 0.8), (25, 1.0), (float('inf'), 1.2))

LAND_AREA = 324.7
LAND_UNIT_PRICE = 788000

BUILDING_AREA = 490.86

BUSINESS_AREA = 173.91
BUSINESS_UNIT_PRICE = 764000

HOUSE_AREAS = (6.09, 114.96, 40.47, 114.96, 40.47)
HOUSE_UNIT_PRICE = 637000
HOUSE_WITH_LAND_PRICE = 337000000


def get_progressive_tax(table, basis):
  s = 0

  for i, j in table:
    if 0 >= basis:
      break

    tmp = min(1000000 * i, basis)
    
    s = s + tmp * j / 1000
    basis = basis - tmp
  
  return s


# business building
basis = BUSINESS_AREA * BUSINESS_UNIT_PRICE * 1.1 * 0.7

principal = basis * 2.5 / 1000
education = principal * 0.2
city = basis * 1.4 / 1000
resource = get_progressive_tax(RESOURCE_TAX_TABLE, basis)

total = principal + education + city + resource

print("business")
print("son: %d, mom: %d" % (total / 2, total / 2))

# house
total_house_area = 0
for i in HOUSE_AREAS:
  total_house_area = total_house_area + i

house_land_area = LAND_AREA * total_house_area / (total_house_area + BUSINESS_AREA)

principal_list = []
education_list = []
city_list = []
resource_list = []

son_sum = 0
mom_sum = 0

for i in HOUSE_AREAS:
  basis = HOUSE_WITH_LAND_PRICE * 0.6 * i / total_house_area

  land_price = LAND_UNIT_PRICE * LAND_AREA * i / (total_house_area + BUSINESS_AREA)
  building_price = HOUSE_UNIT_PRICE * i
  son_rate = building_price / (land_price + building_price) / 2

  tax = get_progressive_tax(HOUSE_TAX_TABLE, basis)
  son_tax = tax * son_rate
  mom_tax = tax - son_tax
  principal_list.append((son_tax, mom_tax))

  son_sum = son_sum + son_tax
  mom_sum = mom_sum + mom_tax

  son_tax = son_tax * 0.2
  mom_tax = mom_tax * 0.2
  education_list.append((son_tax, mom_tax))

  son_sum = son_sum + son_tax
  mom_sum = mom_sum + mom_tax

  tax = basis * 1.4 / 1000
  son_tax = tax * son_rate
  mom_tax = tax - son_tax
  city_list.append((son_tax, mom_tax))

  son_sum = son_sum + son_tax
  mom_sum = mom_sum + mom_tax

  basis = building_price * 0.6
  
  tax = get_progressive_tax(RESOURCE_TAX_TABLE, basis)
  son_tax = tax / 2
  mom_tax = tax / 2
  resource_list.append((son_tax, mom_tax))

  son_sum = son_sum + son_tax
  mom_sum = mom_sum + mom_tax

print("house")
print("son: %d, mom: %d" % (son_sum, mom_sum))