He needs to buy 60*.6=<<60*.6=36>>36 pounds
So he needs to buy 36/2=<<36/2=18>>18 weight plates
That would cost 18*5=$<<18*5=90>>90
Since he bought more than 10 he gets a discount so he gets 90*.2=$<<90*.2=18>>18 off.
That means he paid 90-18=$<<90-18=72>>72
#### 72