E$12.$ In the United States of Pretendistan, income is taxed as follows:

if your income it at most $$20,000$ per year, you pay $5\%$ of your total income as tax

otherwise, you pay $8\%$ of your total income as tax

Complete the function compute tax that uses an if$-$statement to compute and return the total tax due for the salary stored in the argument named salasy. Test your code on incomes of $$10,000($return value should be $$500)$ and $$100,000($retum value should be $$8,000).$