99 +99= 198
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Per cent.
One hundred and twenty is 240 per cent of 50.
"Per centum" is the Latin term from which we derive the English word "percent" (somtimes rendered "per cent"). It literally means "of (or, out of) one hundred".
100. Same as cents in a dollar. Cent comes from the Latin word for one hundred (Centipede, century, per cent).
ppt = parts per thousand per cent = part per hundred so 10 ppt = 1 % and then 35 ppt = 3.5%