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The percentage of homes with the digital TV services stood at 5% at beginning of 1990 (t=0) and was projected to grow linearly so that, at the beginning of 2003 (t=4), the percentage of such homes was 25%.

a) Derive an equation of line passing through points A(0,5) and B(4,25).

b) Using the equation found in part find out the percentage of homes with digital TV services at beginning of 2001.

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