quake.rb

def strong_enough( earthquake, age )

  starting_strength = 1000
  cumulative_damage = 1
  
  earthquake.each do |shockwave|
    sum = 0
    shockwave.each { |value| sum+=value }
    cumulative_damage *= sum   
  end

  resulting_strength = starting_strength*(1 - 0.01)**age
  puts "earthquake: #{earthquake}"
  puts "age: #{age}"
  puts "resulting strength: #{resulting_strength}"
  puts "cumulative_damage: #{cumulative_damage}"
  
  if resulting_strength - cumulative_damage < 0
    return "Needs Reinforcement!"
  else 
    return "Safe!"
  end
    
      
end

Test.assert_equals(strong_enough([[2,3,1],[3,1,1],[1,1,2]], 2), "Safe!")
Test.assert_equals(strong_enough([[5,8,7],[3,3,1],[4,1,2]], 2), "Safe!")
Test.assert_equals(strong_enough([[5,8,7],[3,3,1],[4,1,2]], 3), "Needs Reinforcement!")