Q If 100 envelopes cost 70 cents, how much would 250 cost? Answer by expert Naomi Hire an expert Our experts in all academic subjects are available 24/7. Don't hesitate to ask questions and start discussions whenever you need professional advice. A If 100 envelopes = 70 cents Then 250 = x cents 100x = 70 × 250 100x = 17500 x = 175 cents = 1.75 dollars Algebra 3 years ago 1220 Views