can you please explain why it is negative

0/10 pts Question1 A U.S. based investor purchased 100 shares of Brazilian mining giant Vale (VALE) for R$29.81 and sold them a year later for R$28.73. At the time of purchase, the Brazilian Real was trading at R$2.332 per U.S. dollar and at the time of the sale of the VALE shares the Brazilian Real was trading at R$2.656 per U.S. dollar. Calculate the U.S. dollar-based percentage return earned by the investor. Note: Enter your answer in percentages. If the return is negative enter a negative sign first. Your answer must be rounded to the nearest second digit after the decimal point. For example, if your calculated return is 3.1847% or 0.031847, enter your answer as: 3.18 15.38 15.38 margin of error+/-0.03