Study the following graphs to answer these questions.
The advertisement cost of colour page per thousand copies for Business world has, from 1997 to 1998
Advertisement cost of colour page per thousand copies for Business world in:
1997:
5000/25000 * 1000 = 200
1998:
20000/30000 * 1000 = 666.67
So, 1998>1997, so increase
Increase = 666.67 - 200 = 466.67
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