Lizzy: Mark has the option of getting a $300 lens with a 20% discount or a $220 lens. How much money does he save by buying the cheaper lens?.
Me: Hmmm, let me think. I think this is the detailed solution:
User
The discount is worth 300 * .2 = $60. So the lens cost 300 - 60 = $240. That means he saves 240 - 220 = $20 by buying the cheaper lens. Final answer: 20.
Assistant