7. When the exchange rate was 80 yen per dollar, the Firm invested y800,000,000 in zero coupon dollar-denominated U.S. bonds. The investment was liquidated one year later when the exchange rate was 110 yen per dollar. The rate of return earned on this investment was 30% in terms of yen. What is the dollar amount for which the bonds were sold: $5.97 million $7.78 million $ 8.35 million $9.45 million $10.14 million a. b. c. d. e