JavaScript:

I cant get my code to display the Letter grade for the following assignment. The code is included below.

My assignment is to convert number grades to letter grades. It is supposed to provide practice using if statements. To start the application should display a prompt dialog box that gets numbers from 0 to 100. Then it should display an alert dialog box that displays the number grade (Number grade = 95) a new line, and the letter grade (Letter grade = A). Add the JavaScript code for deriving the letter grade and displaying it in in an alert dialog box. Data validation for numbers 0 to 100 and display the starting prompt dialog box, no need for a special error message.

This page is displayed after the JavaScript is executed