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

### Instruction:
There are 40 more buyers in the grocery store today than yesterday. There were half the number of buyers yesterday as there were the day before, and the day before had 50 buyers. Nobody visited the store on more than one day. What's the total number of buyers who've visited the store in the three days?

### Response:
 Ikiwa jana idadi ya wanunuzi ilikuwa nusu ya idadi ya wanunuzi siku kabla yake, basi jana kulikuwa na 1/2*50 = <<50*1/2=25>>25 wanunuzi.
Leo kuna wanunuzi 40 zaidi kuliko jana, hivyo kulikuwa na 25+40 = <<40+25=65>>65 wanunuzi leo.
Idadi jumla ya wanunuzi katika duka kwa siku tatu itakuwa 65 wanunuzi leo + 25 wanunuzi jana + 50 wanunuzi siku kabla = <<65+25+50=140>>140 wanunuzi katika duka kwa siku tatu.