Monica has $20. She needs to buy a gallon of milk that costs $2. 50. She also wants to buy yogurt, which costs $1. 20 a cup. Which inequality can you use to find the number of cups of yogurt Monica can buy? 1. 20x 2. 5 Greater-than-or-equal-to 20 1. 20x 2. 5 Less-than-or-equal-to 20 1. 20x 2. 5 < 20 1. 20x 2. 5 > 20.