A family has a child and opens a 529 plan, a tax-advantaged investment account that can be used for educational expenses. The parents and other family members plan to contribute a total of $2,500 at the end of every year. If the 529 plan earns 4.5% annually, what will the value of the account be on the child's 18th birthday? a) $67,138 b) $72,963 c) $81,558 d) $55,982