One year ago a US investor purchaed $100$ shares of a Chinese stock at yuan $20$ per share when the exchange rate was yuan $7\mathrm{.}0/$$$.$ Currently, the share price is yuan $25$ per share, and the exchange rate is yuan $7\mathrm{.}20$ per dollar.

If the investor sells the shares at the current price, how much is the rate of return measured in US dollars?