In JavaScript - write a function to calculate 5 books times the price of one book, which is $10. Output (to the console), the total cost of the books. Need JS code as one and html SEPERATE - can't have js within html

I have this to start, but not working:

JS CODE:

function bookCost(quan, price){ return quan * price; } //write return (bookCost); //call

var quan = 5; var price = 10;

HTML CODE:

????