2. Perform the following operations of computer arithmetic. (A) Add 3.63ten 104 to 6.87ten > 10%, assuming that you have only three significant digits, first with guard and round digits and then without them. (4%) (B) Assuming single precision IEEE 754 format, what decimal number is represent by this word: 19111110100100000000000000000000 ? (4%) (C) show the IEEE 754 binary representation for the floating-point number 20.25ten and -4/7ten in single precision, respectively. (10%)