Math (Confused)

How many international direct-dialing numbers are possible if each number consists of a four-digit area code (the first digit of which must be nonzero) and a five-digit telephone numbers (the first digit must be nonzero)?

a. 567,000,000
b. 486,000,000
c. 1,053,000,000
d. 729,000,000
e. 810,000,000

Thank you for helping.

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  1. 9*10^3 * 9*10^4

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