Chemco Co generates a 25% contribution on weekly chemical sales of $25,000. The managing director proposes to run a special offer on a chemical called Zacco which previously was not sold by Chemco Co. Chemco Co purchases Zacco from a manufacturer at $3.50 per unit. The managing director plans to offer Zacco at $2.40 per unit in an effort to generate increased sales and publicity. Weekly chemical sales excluding Zacco are expected to increase 8% as a result of the promotion and Zacco sales are expected to be 400 units per week.

The effect of the Zacco promotion on Chemco Co's profitability is to increase weekly profit by