Mathematics, 19.10.2019 23:00 annacurry2019

Alisha bought a collection of 500 old pennies. she chose 20 pennies from the collection and recorded their dates. seven pennies had dates earlier than 1980.
what percent of the pennies in alisha’s collection have dates earlier than 1980?
how would i solve this or what do i do ? i'm very confused

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Alisha bought a collection of 500 old pennies. she chose 20 pennies from the collection and recorded...