signage.rb

def cost(length,width,colors)
  x = length * width;
  if colors > 2
    x += colors * 15
  else
    x += colors * 10
  end
  return x * 1.15
end

puts cost(10,10,0);
puts cost(10,10,1);
puts cost(10,10,2);
puts cost(10,10,3);