Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Anahitaji kubadilisha mipira 30*10=<<30*10=300>>300
Bei ya kawaida ni 300*1=$<<300*1=300>>300
Kwa sababu ya punguzo, anapaswa kulipa 300*.75=$<<300*.75=225>>225
Kisha anapata punguzo ambalo linapunguza dola nyingine 225*.2=$45
Hiyo inamaanisha anapaswa kulipa tu 225-45=$<<225-45=180>>180
Hivyo alikuwaokoa 300-180=$<<300-180=120>>120 kwa kununua wakati wa punguzo