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

### Instruction:
Maci is planning for the new school year and goes to the store to buy pens. She needs ten blue pens and 15 red pens. If a blue pen costs ten cents each and a red pen costs twice as much as the blue pen, how much money does Maci pay for the pens?

### Response:
 Kwanza, tafuta gharama ya kalamu za nyekundu: Kalamu kumi na tano zinagharimu 10*15 = $<<10*15=150>>150
Pili, tafuta gharama ya kalamu za bluu: Kalamu kumi zinagharimu 10*10 = $<<10*10=100>>100
Hatimaye, ongeza bei ya kalamu za bluu na nyekundu ili kujua Maci alilipa kiasi gani kwa kalamu: $150 + $100 = $<<150+100=250>>250