3. You decide to enroll in a plan that gives you a 10% discount if you make telephone calls
between 7:00 p.m. and 6:00 a.m. The per minute charge is $0.10 and the sales tax is 6%. On
the first month's bill you used the phone for 130 minutes between 6:00 a.m. and 7:00 p.m. and
then for 400 minutes between 7:00 p.m. and 6:00 am. How much was your total bill?