ROI on Premium Decorations and Buildings

"ROI" stands for "Return on Investment" so, basically, "how much crap I get per donut I spend". The purpose is to use your precious donuts efficiently.

Buildings
Buildings are broken down into units (dollars and XP per hour). The units are also broken down into how many you get per hour for every donut you spend. Without factoring in play time, the higher the better. However, if you only check the game twice a day, the Try-n-Save is NOT a good investment for you. If you check twice a day, then you check, on average, every 12hrs so you would want to choose the Observatory, Sprawl-mart, or Asia de Cuba. MONEY AND XP MEAN NOTHING IF YOU'RE NOT AROUND TO COLLECT IT! *I wasn't sure the character's name so I just put "yes"

Decorations
Decorations are pretty simple: you get a certain bonus % for every donut you spend. The higher the better.