Mọi người chỉ mk vs ạ cần lời giải thích nữa

(D) the correct answer. 1. How much is a large envelope? (A) 10 cents (B) 50 cents (C) 75 cents (D) 150 cents 2. How many different types of envelopes are available? (A) Three (B) Four (C) Five (D) Six 3. How much would 100 small envelopes cost? (A) $45 (B) $50 (C) $70 (D) $75 4. Where ...