Simplify the following text for a Grade 6 native English-speaking person.
Original: According to the study , if all this software had been developed by conventional proprietary means , it would have cost about $ ( US dollars ) to develop in the United States .
Simplified: the study also said , if all this software had been made by proprietary means , it would have cost about 1.08 billion dollars ( in year 2000 U.S.A. dollars ) to make in the United States .