From the carwash, Hank donates $100 * 0.90 = $<<100*0.90=90>>90
From the bake sale, Hank donates $80 * 0.75 = $<<80*0.75=60>>60
From mowing lawns, Hank donates $50 * 1.00 = $<<50*1=50>>50
Hank donates a total of $90 + $60 + $50 = $<<90+60+50=200>>200
#### 200