Following is the last year data of X company: Selling price $80 per unit Variable expenses $40 per unit Fixed expenses for the year $180,000 The company sold 45,000-unit last year. Managers of X company believes that the sales can be doubled when expenditure on advertising is increased by $1.50 per unit, keeping the selling price same as last year. Determine the amount by which advertising can be increased with profits remaining unchanged? a. $1,665,000 b. $1,800,000 c. $1,500,000 d. $1,660,000