Dunkin has decided they would like to perform a flash sale on one of their breakfast sandwich products. This item normally sells at $3.79 per unit with a cost of $2.27. The promotional price is going to be $2.99. They are hoping to boost their sales from 100 units to 150 units while maintaining a 35% markup for the sale. How many breakfast sandwiches should they sell at $2.99 before raising the price back up to regular price to maintain their desired maintained markup?