I am not very knowledgeable about economics and am trying to reword these two sentences:
In 1964 the CDC 6600 cost around $7 million USD, though some sources site prices of up to $10 million. Given the relative value of the dollar in today’s economy, the machine would cost very much more; depending on the economic formulas used could cost $700 million.
All prices are in US dollars. The point I'm trying to make is that $7 million dollars was a lot more in 1964 than it is today, but this is hard to convey because even today $7 million is a lot.
According to here " $7,000,000.00 from 1964 ranges from $39,900,000.00 to $166,000,000.00." today.
When writing money is it correct to write the first part of the number using digits, followed by the word? For example $10 million vs $10,000,000.