The answer to this question is C.
I don't really understand it though.
Could someone go through this question and explain to me why it has to be C and not A,B or D?
Thanks.
It's just a simple question to calculate the percent of personal tax income.
Go through the options like this:
A. For an income of 10000, the tax charged is

For an income of 20000, the tax charged is

B. For an income of 10000, the tax charged is 10%
For an income of 20000, the tax charged is

C. For an income of 10000, the tax charged is 10%
For an income of 20000, the tax charged is

D. For an income of 10000, the tax charged is

For an income of 20000, the tax charged is

Now since these are
direct taxes on income, we expect a higher income to have a higher tax rate (or at least the same tax rate as the previous lower income). As we can see for C, for the 10000 we charged a tax of 10% yet for a higher income of 20000 we charged a tax rate of only 7.5% which is lower than 10%. This is an uneven distribution of wealth (the poor has to pay more money as tax than the rich)