Mr. ishimoto ordered x new math books and y new workbooks for his class. the total weight of the box of books cannot be more than 50 pounds. if each math book weighs 3.2 pounds and each workbook weighs 0.8 pounds, which inequality represents the maximum number of each type of book that can be shipped in a single box?
a. 3.2x + 0.8y < 50
b. 3.2x + 0.8y ≤ 50
c. 0.8x + 3.2y < 50
d .0.8x + 3.2y ≤ 50