Astudents cost for last summer at her community college was 2800. she spent 560 of that in books. what percent of last semesters college cost was spent on books?

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.