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

### Instruction:
Steve bought $25 worth of groceries. He bought a gallon of milk for $3, two boxes of cereal for $3.5 each, 4 bananas for $.25 each, four apples that cost $.5 each and a number of boxes of cookies. The cookies cost twice as much per box as the gallon of milk. How many boxes of cookies did he get?

### Response:
 Nafaka ziligharimu 2*3.5=$<<2*3.5=7>>7
Ndizi ziligharimu 4*.25=$<<4*.25=1>>1
Tofaa ziligharimu 4*.5=$<<4*.5=2>>2
Alitumia $3+$7+$1+$2=$<<3+7+1+2=13>>13 kwa vitu vyote isipokuwa biskuti
Alitumia $25-$13=$<<25-13=12>>12 kwa biskuti
Biskuti ziligharimu $3*2=$<<3*2=6>>6 kwa kila sanduku
Alinunua masanduku 12/6=<<12/6=2>>2 ya biskuti