anna coren a sole proprietor of a business that designs and sews outdoor clothing for dogs. each year she rents a booth at the regional pet expo and sells only blankets. coren views the expo as primarily a marketing tool and is happy to breakeven that is cover her booth rental. for the last 3 years she has sold exactly enough blankets to cover 750$ booth rental fee. this year she decided to make all blankets for the expo out of high tech waterproof/ breathable material that is more expensive to produce but she believes that she can sell for a higher profit margin. information on the two types of blanket is as follows

per unit last year

basic blanket sale price $25 variable cost $2

this year

new blanket sale price $40 variable cost $33

assuming that coren remains most interested in covering the booth cost which is increased to 840. how many more or fewer blankets new style does she need to sell to cover the booth cost?