While sifting through the folder of receipts and records for my '76, I found the sales contract where my car was sold Used in 1977 (after apparent short "new" ownership)
Sale price was $7500 financed at 13%!!!
According to the U.S. Department of Labor, my cars "purchase price" was equivalent to $25235.00
at a 5 year rate, here's what the previous owner would have paid:
Cumulative Payments: $34,450.52
Total Interest Paid: $9,215.52
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U.S. Department of Labor Inflation Calculator