I need to understand the calculations please ?

Suppose an investor buys a Taiwanese bond with a face value of NT20,000, which is priced at NT$19, 500 and bears a coupon of NT$1, 700. At the end of the year, the investor sells the bond at a price of NT$18, 030. During the year, the exchange rate goes from NT$1 = U.S.$0.0375 to NT$1 = U.S.$0.0425. What was the investor's U.S. dollar return on this bond? a) 13.33% b) 4.23% c) -5.69% d) 14.67%