 
 <prompt> ```Ronald wan make profit by resell some phones wey e buy one week ago. E buy 200 units for just $3000, and e wan gain one third of the initial investment as profit when all units don sell finish. Including the profit margin, wetin go be the selling price for each phone?``` <response>: ```Ronald wan make profit na $3000 / 3 = $1000
The profit wey go come out from each phone wey dem sell go be $1000 / 200 phones = $5/phone
The cost of each phone na $3000 / 200 phones = $15/phone
The selling price wey include profit go be $15/phone + $5/phone = $20

Answer na 20.``` 