500 PS

The question is asking for the net income before taxes. The taxes are levied on income after the first 3000.

Assume income before taxes is x.

The total net income after taxes: (x-3000) * 0.9 + 3000 = 12000
(x-3000) * 0.9 = 9000
x = 9000/0.9 + 3000
x = 13000

0.9 above is the income left after taxes of 10%.

Answer is B

Oh - I got it! Thank you!

let the initial income paying tax be x.
$$Now,\ 10\%\ of\ x=\frac{10}{100}\cdot x$$
After paying/removing 10% tax, we have ,
=x - 10% of x = 12000
i.e x-001x = 12000
0.9x = 12000
$$x=\frac{12000}{0.9}=\ $13333\ \frac{1}{3}$$
Therefore, the initial income before taxes is $13333 (1/3);
Thus, the closest answer from the available options is $13,300 which is option A