From Longman Business Dictionary
tonton /tʌn/ noun (plural tons or ton) [countableC]1a unit for measuring weight, equal to 2,240 pounds or 1,016 kilograms in Britain, and 2,000 pounds or 907.2 kilograms in the USThe quarry produces about 6,000 tons per annum.
a price of $150 a ton
→ compare tonne → American ton → long ton → metric ton → net ton → short ton2informal used when talking about money to mean a ‘hundred’, for example £100 or $100 million