Plan two: 17.99+(0.35x). X equals charge per minute at night and weekends.
We can subtract our main payment plans that don’t include variables, 23.99-17.99=6. We can then divide by our constant... 6/0.35 to get 17.14... minutes. so we can round up to 18 mins.
To make sure we are correct we can do,
17.99+(0.35)(18) to get 24.29 which is greater than 23.99.
