A zero-coupon bond pays no interest during its lifetime. Upon maturity, the investor receives face value. The purchase price determines the rate of return. (a) Henri paid $10,500 for a $30,000 face value zero-coupon bond that matures in 10 years. Find the annual compound rate of interest received. (Round your answer to two decimal places.) (b) Sandi plans to purchase a zero-coupon bond with a face value of $10,000 and matures in 6 years. She wants to earn 6.8% compounded annually. Find the price she should pay. (Round your answer to two decimal places.)