The answer should be B if I am correct
So basically it takes 10 people to paint a whole building. Forget about the 5 days. That's just there to confuse you. You have to first find out how much of a building can one person paint so, 1/10. So that means that 7 people can paint 7/10 of a building in 5 days
137.2
30
$298.30
390
5970
3050
16
150
5500000