So I've been doing a lot of: Tourist x wants to orbit Kerbin missions. I was wondering if there was a design that somebody has that can take 4 or more kerbals into orbit around Kerbin and return them, and hoping to keep cost relatively low to improve my current money making efficiency. I can currently send 3 kerbals to orbit and back using OKTO probe control and the rocket cost 20,260. However, most of the time the contracts are only for 20k per kerbal. So if anybody could share a design that is more efficient I would be appreciative as I've been trying for 6 hours to get a 4 kerbal probe up there and back, but always fall short unless I spend like 40k for the rocket. Also, my science is only into the 90's bracket with Advanced construction, Aerodynamics, and Electrics.