Sam runs his own sandwich truck on the U of C campus. The monthly cost of the truck and necessary campus permit is \($595.\) Sam spends \($2.10\) on each sandwich sold, including all of the ingredients, condiments, and paper products. He sells each sandwich for \($3.50.\) }

a. How many sandwiches does Sam have to sell each month to break even?

b. Predict operating income for a month in which Sam sell 1,200 sandwiches.