Kyona opened a savings account with $500. Her account grew at a rate of 3% per year compounded annually. She made no deposits or withdrawals on the account. At the end of 4 years, what was the
account worth, to the nearest dollar?

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of