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I need help with a probablity question?

Fred went to Vegas and decided to play roulette. There are 18 black numbers,18 red numbers, and 2 green numbers on the roulette wheel. Fred decides to put $5 down on black. Over time, Fred can expect to

A. win approximately $2.60.

B. lose $0.26 on each bet.

C. win $0.26 on each bet.

Answers (2)

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18/38 x (win5) + 20/38 (lose 5)

= 18/38 • 5 - 20/38 • 5 = -0.26

so B