Explore variables using the env and the set commands.

Create a new variable named hrs$\_$worked. Assign hrs$\_$worked a value of $20.$

Create a new variable named hrly$\_$rate. Assign hrly$\_$rate a value of $38.$

Create another variable named pay and assign it the value of hrs$\_$worked times hrly$\_$rate.

export all $3$ variables.

Set hrly$\_$rate to readonly. Try to unset hrly$\_$rate.

Use the echo command to see the values of all $3$ variables.