Help plz
<3
pre-algebra

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.

Find the amount of simple interest earned for depositing the given principle in an account if $2200 is invested at 5.5 % for 6 months

Six random samples were taken each year for three years. the table shows the inferred population for each type of fish for each year.