Board Thread:Plants vs. Zombies 2/@comment-5760976-20160528110732/@comment-25180538-20160605000906

How is this supposed to work?

Damage rate BEFORE upgrade:

50 sun -> 27.5 NDS

so 800 sun -> 440 NDS

Damage rate after upgrade:

800 sun -> 80 NDS

How is this an upgrade again?