Question 112416
When x% of the citizens participate then the cost is:
C = 1.4x/ (100 - x)

When 60% of citizens participate,

C = 1.4*60/(100-60)

  = 84/40

  = 2.1

Thus if 60% participate the cost is $2.1 million.

(b) Let x be the % od participation

Then 1.4x/ (100 - x) = 4

==> 1.4x = 4(100 - x)

==> 1.4x = 400 - 4x

==> 1.4x + 4x = 400

==> 5.4x = 400

==> x = 400/5.4

==> x = 74.074

Thus if $4 millions is spent then approx 74% of the citizens must have participated.


Good luck!!!