The van class, given below, is used by a small shuttle service that transports passengers around new england. the attributes for this class are: a van's id; a van's capacity - the number of passengers it can carry, a van's driver, and a van's range - how many miles it can go in a single trip. a van's range can be variable: extra gas tanks are sometimes available, which extend a van's range, but sometimes single trip travel is limited by state law. public class van{ private string id; private int capacity; // how many passengers does van hold? private string driver; // who's driving? private int range; // miles traveled on one tank of gas public van(string id, int cap, string d, int r){ this. id = id; capacity = cap; driver = d; range = r; } public string getid(){ return id; } public int getcapacity(){ return capacity; } public string getdriver(){ return driver; } public int getrange(){ return range; } public void setdriver(string newguy){ driver = newguy; }}in the box below, enter the code for a new public method called changerange, which is to be added to the van class definition. it should take one parameter, a double value. if somevan is a van in the company fleet, thensomevan. changerange(.2); should change the range of the van by .2, or 20%. if the initial range of somevan was 300 miles, its new range should now be 20% higher, or 360 miles. on the other hand, this statement: somevan.); should reduce the range by 10%. thus, if the initial range of somevan was 300 miles, its new range should now be 10% lower, or 270 miles. enter the complete code for this method in the box below.