John has to replace the ball bearings for machines he works with.  He has 10 machines and they take 30 ball bearings each.  It normally costs $1 per ball bearing but right now there is a sale where they are only $.75.  Also since he is buying in bulk he gets a further 20% discount.  How much money did he save by buying them all during the sale rather than 1 at a time?
He needs to replace 30*10=<<30*10=300>>300 ball bearings
The normal price is 300*1=$<<300*1=300>>300
Because of the sale he only has to pay 300*.75=$<<300*.75=225>>225
He then gets a discount which shaves another 225*.2=$<<225*.2=45>>45 off the price
That means he only pays 225-45=$<<225-45=180>>180
So he saved 300-180=$<<300-180=120>>120
#### 120