need help with this C++ problem please

A country charges its citizens an income tax each year. The tax rate is based on the Income of the year according to the following table: Income ($) Tax Rate Income = 40000 23.7% Write a function that takes a person's income and returns his taxes. The main function should prompt at least five users for their income, call the function, and print out their taxes. For efficient review of your assignment, you may consider to declare and use income array as follows: double income[]={5000, 10000, 20000, 40000, 50000}