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

### Instruction:
 Baadhi ya wanafunzi wanataka kununua penseli kutoka duka la vifaa vya shule. Bei ya penseli moja ni senti 20. Tolu anataka penseli 3, Robert anataka penseli 5 na Melissa anataka penseli 2. Wanafunzi wote watatumia kiasi gani (katika dola) katika duka la vifaa vya shule?


### Response:
 Penseli 3 zinagharimu 3 * 20 = <<3*20=60>>60 senti
Penseli 5 zinagharimu 5 * 20 = <<5*20=100>>100 senti
Penseli 2 zinagharimu 2 * 20 = <<2*20=40>>40 senti
Jumla ya penseli zote ni 60 +100 +40 = <<60+100+40=200>>200 senti
Senti 100 ni sawa na dola moja hivyo 200 senti ni sawa na 200/100 = 2 dola.