Mrs.C(widow) receives salary 420,000baht/month.Her employer withholds tax 85,000baht/month.
She has 1 baby and 1 child studying in Thailand.
She paid for social security fund 750baht/month and for her life insurance premium 70,000 baht/year.
She donates 50,000 baht to the Thai Red Cross Society.
How much tax burden does she have?(show detail of calculation)