Apparently in the late 1960s there were some according to the link below.
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A red cent was a paper token, colored red. During WWII they were used for change in return for rationing coupons. "not one red cent" = "not a penny"
7 percent is 7/100. Percent is "per cent", cent meaning 100 in Latin.
"per-cent"means divided by 100 to get fraction 70% = 70/100 = 7/10
280
17.5% = 7/40