Task $2$: computeTax$()$

Write a method named computeTax that accepts a salary as a parameter and returns the amount

of tax you would owe if you made that salary. The tax is based on your tax bracket found in the

first two columns below. Once you know which row to use, start with the "flat amount" and add

the "plus $\%"$ of the amount over the amount listed in the final column. For example, if your

income is $$50,000,$ then you use the third row of the table and compute the tax as $$4,000$ plus

$25\%$ of the amount over $$29,050,$ which comes to $$9,237\mathrm{.}50.$ The total tax of $$27,500$ is

$$3,767\mathrm{.}50.$ For $$6,000,$ the tax is $$600.$ For $$120,000,$ the tax is $$28,227.$ If a negative salary is

given, your method should return $-1.$