Amy’s sells kale at x dollar per pound for the first 20 pounds and .8x

Amy’s sells kale at x dollar per pound for the first 20 pounds and 0.8x for every subsequent pound. Lucia’s price is x per pound for the first 14 pounds and 0.9x for subsequent pounds. What is the minimum number of pounds over 15 for which Amy’s becomes an equal or better deal? A. 24 B. 25 C. (…)