Tokyo Olympic Games.Giselle Nolan had planned her trip to the Olympic Games in Tokyo, Japan, for many months. She had budgetedlong dashsavedlong dashUSD$15$ comma $50015,500$ for expenses while in Tokyo. Giselle had waited till the last minute, however, to exchange the dollars for Japanese yen $($JPY$),$ doing it in the San Francisco airport in the United States on July $30$ at JPY $109\mathrm{.}63$JPY$109\mathrm{.}63$equals$=1\mathrm{.}00$USD. Given the following average exchange rates in the spring and summer of $2021,$ LOADING... $,$ when should she have exchanged the dollars for yen to maximize her Tokyo spending money?