
Actually Welcome to the concept of calculations of bills.
The bill calculation goes as equation,
y = $250 + n*($10)
here, n = number of lines,
1.) For n = 2 , Y = cost = 250 + 20 = $270
2.) for n = 4 , Y = $290
3.) for n = 6 , Y = $310
4.) for n = x, Y = $250 + x*($10)
for lastly 12 members we get as,
Y = 250 + (12)*(10) = 250+120 = $370
8/(9/6)
(8/1)/(9/6)
(8/1)*(6/9)
48/9
5 1/3
8,500,000
Round the number 4 to 5 because the number 7 is behind it.
Answer:
The answers and steps are in the picture