Valeria is ordering medals for her school's track meet. company a charges $4.50 for each medal and a one-time engraving fee of $40. company b charges $6.50 for each medal and a one-time engraving fee of $20. which inequality can be used to find x, the least number of medals that can be ordered so that the total charge for company a is less than the total charge for company b? a) 4.5 + 40x < 6.5 + 20x b) 4.5 + 40x > 6.5 + 20x c) 4.5x + 40 < 6.5x + 20 d) 4.5x + 40 > 6.5x + 20