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

### Instruction:
Cary is an engineer in charge of designing an irrigation system for three farmers. Farmer Bob grows 3 acres of corn, 9 acres of cotton, and 12 acres of beans. Farmer Brenda grows 6 acres of corn, 7 acres of cotton, and 14 acres of beans. Farmer Bernie grows 2 acres of corn and 12 acres of cotton. If corn takes 20 gallons of water an acre, cotton takes 80 gallons of water an acre, and beans take twice as much water as corn, what percentage of the total water used will go to Farmer Bob's farm?

### Response:
 Kwanza, tafuta ni kiasi gani cha maji maharagwe yanatumia kwa kuzidisha matumizi ya maji ya mahindi kwa 2: galoni 20/ekari * 2 = <<20*2=40>>40 galoni/ekari
Kisha, hesabu matumizi ya maji ya Bob kwa kuzidisha matumizi ya maji ya kila mmea kwa ekari na idadi ya ekari alizopanda, kisha ongeza jumla ya matumizi ya maji ya mazao yote matatu: 3 * 20 + 9 * 80 + 12 * 40 = <<3*20+9*80+12*40=1260>>1260
Sasa fanya hivyo hivyo kwa Brenda: 6 * 20 + 7 * 80 + 14 * 40 = <<6*20+7*80+14*40=1240>>1240
Na fanya hivyo hivyo kwa Bernie: 2 * 20 + 12 * 80 = 1000
Sasa ongeza matumizi ya maji ya kila mkulima ili kupata jumla ya matumizi ya maji: 1260 + 1240 + 1000 = <<1260+1240+1000=3500>>3500
Sasa gawanya matumizi ya maji ya Bob na jumla ya matumizi ya maji na kuzidisha kwa 100 ili kupata asilimia ya maji aliyotumia: 1260 / 3500 * 100 = <<1260/3500*100=36>>36%