self Maths Puzzle

How many 4-digit even numbers >4000 can be formed by using the digits 0-9, if the digits may be repeated?

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self Other Question

What is the probability that 6 favorite songs will be played together out of 30 songs, if all 30 are listened to? A manufacturer of a certain item can sell all items he can produce at the selling price of Rs. 60 each. It costs him Rs. 40 in a material and labour to produce each item and he has overhead expenses of Rs. 3000 per week to operate that plant. The number of units he should produce and sell in order to make a profit of at least Rs. 1,000 per week is-