The relationship between expenditure in Rs on advertising (X) in one...

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The relationship between expenditure in Rs. on advertising (X) in one time period and sales in Rs. (Y) in the next period has been found to be Y = 50 + 7X. Which of the following interprets the value 7 correctly?

A. For every Rs. 1 spent on advertising, sales increase by Rs. 7 on average

B. For every Rs. 1 increase in sales, Rs. 7 must on average be spent on advertising

C. For every Rs. 1 spent on advertising, sales increase by Rs. 8

D. When advertising is zero, sales are Rs. 50/7

Answer: Option A

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