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

### Instruction:
 Inagharimu $.10 kuchapisha ukurasa mmoja. Jenny anataka kuchapisha nakala 7 za insha yake yenye kurasa 25. Pia anataka kununua kalamu 7 ambazo kila moja inagharimu $1.50. Ikiwa atalipa dukani kwa kutumia noti mbili za dola ishirini, atapata pesa ngapi kama mabadiliko?


### Response:
 Jenny anahitaji kuchapisha kurasa 7*25= <<7*25=175>>175.
Hii itagharimu 175*$.10 = $<<175*.10=17.50>>17.50.
Kalamu zitagharimu 7*$1.50 = $<<7*1.50=10.50>>10.50.
Jumla atatumia $17.50+$10.50 = $<<17.5+10.5=28>>28.
Kwa kuwa analipa na noti mbili za dola ishirini, atalipa kwa jumla 2*20 = <<2*20=40>>40 dola.
Hivyo, atapata $40-$28 = $<<40-28=12>>12 kama mabadiliko.