Book Maths Puzzle Numerical Ability

what is the last digit of the expression 4x9^2x4^3x9^4x4^5x9^6x...........x4^99x9^100 ?

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Book Other Question

1.Find the number of pages in a book which has on an average 207 words on page, and contains 2,01,411 words altogether.

2.a cinema hall is to be constructed in which each row must have 36 seats.Determine the minimum numbers of rows required to seat 600 persons at a time.

3.a security checkpoint can check up to 250 people per hour.What is the greatest number of people that can be checked in 5 days? find the smallest number n such that n! is divisible by 990