What helps advertisers decide what works and what could be improved?

You want to have $80,000 in your savings account 11 years from now, and you’re prepared to make equal annual deposits into the account at the end of each year. if the account pays 6.30 percent interest, what amount must you deposit each year? (do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)

Which plan offers a tax-free education?

What percentage of hard rock's profit is derived from retail shop sales?