[求助]一道数学题，请大家帮帮忙！！！

acinderellas

After paying a 10 percent tax on all income over $3000,a person had a net income
of $12000.What was the income before taxes?

britney-gao

列个式子解一下就出来了

设税前收入为X

则 X-(X-3000)*10%=12000

X=13000

acinderellas

恩，谢谢!!