What happens if you cut medicine prices by 600%?

Let's say there's a $100 medicine. A 50% cut makes it $50, a 100% cut makes it $0... So what the hell is a 600% cut?
"Users are baffled by the math of a 600% discount, joking that the government is basically promising 'cashback' for getting sick to appeal to voters tired of insane medical bills."
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