Probability and Expected Value on picks

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There are 3 empty boxes (A,B,C) where each box filled with 100 numbered balls (number 00 to number 99) each box. Every play cost me 1 coin and allow to select 1 number from 00 to 99, then a ball is drawn from each box.

There are prizes to be won as below:

Pool Prize : All 3 boxes draws same with your selection, Initial Pool is 100 coins and it will increase by 1 coin if the pool not hit.

Prize A : Box A draws the same number to your selection, 30 coins.

Prize B : Box B draws the same number to your selection, 20 coins.

Prize C : Box C draws the same number to your selection, 10 coins.

My question:

  1. How do I calculate my chances on hitting the pool and proof that my expected value will become favor to me (from lost to earn)?

  2. To proof my losses of coins control at -8% (negative 8 percent) when I hit the pool? Example: I hit the pool on the 1,000th play, 1,000 coins on play but sum on my return is 920 coins, i lost 80 coins (8% of coins from 1,000 coins)

Logical assumption and changes allowed for no.2.

What I understand:

Each number has a probability of 1% where 1/100 = 0.01 (1%)

Hitting Box 1, 2, 3 = 30, 20, 10 Coins (each has 1% chance)

Return rate = 0.3, 0.2, 0.1 on every of my play and lost 0.4 each play.

Total Combination available is 100 x 100 x 100 = 1,000,000

1 chance out of 1 million combination hitting the pool, where 0.01 x 0.01 x 0.01 = 0.000001 (0.0001%)