Given:

double hours$\_$worked;

double pay$\_$rate;

double gross$\_$pay;

Assume the values of hours$\_$worked, pay$\_$rate, and gross$\_$pay have been entered. Write a Java code fragment to calculate gross pay based upon the following rules:

The employee receives regular pay for first $40$ hours.

Pay double time for hours worked over $40$ hours and less than $50$

Pay triple time for hours worked over $50$ hours.