The sum of ten positive odd numbers is 20. Some numbers may repeat, find the largest number that is used in this sum. (If possible please show me the step-by-step process, it would really help me)

Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earned $75 in interest. how much interest will she earn during the following year? show your work and explain your reasoning in the space provided below.