A nurse has an annual income of $48,752 the income taxes to 20% rate what is the amount of the nurses income tax in dollars and cents

So you convert 20% into a decimal and you get 0.20, then multiply that by her annual income (annum/annual always refers to per year, always pay attention to wording)

Therefore you perform the operation 0.20 x $48 752 = $9750.40 are given to taxes and she is left with $39 001.60 that are not given to tax.