A summer camp is organizing a hike and needs to buy granola bars for the campers. The granola bars come in small boxes and large boxes. Each small box has 12 granola bars and each large box has 30 granola bars. How many granola bars are there in 8 small boxes and 7 large boxes? How many granola bars are there in ss small boxes and ll large boxes? I have the answer, it's 306, but I need the equation with the variables, s and l, stands for small boxes and large boxes.