Write PHP Program to assign grades to students based on the following criteria; Grade “A” if score is from 80% and above , Grade “B” if score is greater or equal to 60% but less than 80%, Grade “C” if...

Write PHP Program to assign grades to students based on the following criteria;

Grade “A” if score is from 80% and above , Grade “B” if score is greater or  equal to 60% but less than 80%, Grade “C” if score is at least 40% but less than 60%, Grade “F“ if score is less than 40%.