I don't understand the following:
Always buy infrastructure, technology and land in bulk (10/10/20 levels respectively), this now a written rule, you’ll spend more money if you buy uneven amounts, as the price increases as you buy more of them. Keep your soldiers at 20-30% of your total citizens during peace time, there’s no need to pay extra upkeep because of them. If you purchase too many your population will riot!
Current Dollars Available: $230.20 (Surplus)