Question 389381
Let {{{x}}} = the original number of members in the group
given:
{{{2000000/x}}} is the contribution from each original member
{{{2000000 = (x - 40)*(2000000/x + 2500)}}}
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{{{2000000 = 2000000 - 80000000/x + 2500x - 100000}}}
{{{80000000/x = 2500x - 100000}}}
{{{80000000 = 2500x^2 - 100000x}}}
{{{32000 = x^2 - 40x}}}
{{{x^2 - 40x + (40/2)^2 = 32000 + (40/2)^2}}}
{{{x^2 - 40x + 400 = 32400}}}
{{{(x - 20)^2 = 180^2}}}
{{{x - 20 = 180}}} (ignore the negative root)
{{{x = 200}}}

(a) 
There were 200 original members in the group
(b)
{{{.45*2000000 = 900000}}}
{{{2000000 - 900000 = 1100000}}}
{{{1100000/(200 - 40) = 6875}}}
6,875 is needed from each remaining member
(c)
labor/money = {{{6/19}}}
money/(labor + money) = {{{19/(6 + 19)}}}
money/(labor + money) = {{{19/25}}}
{{{1100000*(19/25) = 836000}}}
836,000 is the total amount of money contributed by the members
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check part (a)
{{{2000000 = (x - 40)*(2000000/x + 2500)}}}
{{{2000000 = (200 - 40)*(2000000/200 + 2500)}}}
{{{2000000 = 160*(10000 + 2500)}}}
{{{2000000 = 1600000 + 400000}}}
{{{2000000 = 2000000}}}
OK