hehe, what a scam...
Found it:
"Inflation reached 9.1% in 1975, the highest rate since 1947. Inflation declined to 5.8% the following year, but then edged higher. By 1979, inflation reached a startling 11.3% and in 1980 soared to 13.5%."
So 10% CD with 13.5% inflation is not that...