The marker cos 1/3 as much as the pen. the pen cost 1/3 as muc as the book. the book cost 1/3 as much as the game. the price of the marker is what fraction the price of the game?

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.