A regression analysis between sales (in sh. 1000) and advertising (in sh.1) resulted in the following least squares line: y = 80,000 + 5x. This implies that an; Select one: Increase of sh.5 in advertising is expected to result in an increase of sh. 5,000 in sales Increase of sh.1 in advertising is expected to result in an increase of sh. 5,000 in sales. Increase of 1 shilling in advertising is expected to result in an increase of sh. 80,005 in sales Increase of 1 shilling in advertising is expected to result in an increase of sh. 5 in sales