Percents
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1993 = 1000 video cameras
1994 = 1000 + 1000X/100= 1000 + 10X
1995 = 1000 + 10X +(1000 + 10X)*Y/100
= 1000 + 10X + 10 Y + XY/10
= 1000 + 10(X+Y+XY/100)
B solves the puzzle
1994 = 1000 + 1000X/100= 1000 + 10X
1995 = 1000 + 10X +(1000 + 10X)*Y/100
= 1000 + 10X + 10 Y + XY/10
= 1000 + 10(X+Y+XY/100)
B solves the puzzle