non-savings saving total
employment income 7500
bank interest 4000*100/80 5000
Net income 7500 5000
Less:personal allowance (6475)
taxable income 1025 5000
income tax
non-saving 1025*20% =205 (这个我明白)
saving (2440-1025)=1415*10%=141 (这个为什么要减去1025呢)
(5000-1415)=3585*20%=717 (这个为什么要前去1415呢)
tax liability 1063
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