Using C++ please

Write a prototype and a definition of the function total that takes one integer parmeter (number of items sold); two double parameters (price of item and sales tax rate) d returns total price of the purchase with tax. (NOTE: it is your responsibility to choose the return data type Just to give you an idea: if I call the function total for 10 items sold, 12 dollar price of the item and 03 tax, I would write the following code float x-0.0 x total (10, 12, 0.03))