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Let X denote a digit that can take any of the values 0 through 9, N...

Let X denote a digit that can take any of the values 0 through 9, N denote a digit that can take any of the values 2 through 9, and Y denote a digit that must be a 0 or a 1. The format of phone numbers in North America is NYX- NNX-XXXX in the old plan, and NXX-NXX-XXXX in the new plan. How many different phone numbers are possible under the old plan and under the new plan?

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