Given that each book weighs 3.2 pounds, the total weight of x new books is 3.2x. Similarly, the total weight of the new workbooks is 0.8y. Thus, the total weight of the books is 3.2x + 0.8y. This value should be lesser than or equal to 50. The inequality is expressed as, 3.2x + 0.8y ≤ 50. This is second among the choices.