Fast Money! No cost! in The Sims FreePlay

If you have about 5-10 Sims this will work best. So say you have 10 Sims, have all the Sims garden the tomatoes at once it only gives you 4 per patch but all together it will give you 40 coins in only 30 seconds. Do this over and over again and make over 100 in less than 90 seconds