QUESTION:
How much did it cost to research, develop, and build the Mars rover?

ANSWER from Donna Shirley on October 12, 1997:
The rover cost $25 million to design, build, test and operate.  That is less
than most movies cost to make these days. All of that money went to pay the
salaries of the people who worked on her, or to buy the parts to build the
rover out of.  It took four years to build Sojourner.

Donna Shirley