4. (Exchange rate; devaluation) The Thai baht (Bt) was devalued by the Thai government from Bt 25/$ to Bt 29/S on July 2, 1997 (a) By what percentage did S (USD) change in Bt value on July 2, 1997? (b) Many currency analysts were predicting that the Thai baht would fall an additional 40% from Bt 29 s to Bt X/S by the end of 1997. What is the value of X? (to four decimal places) (c) From mid-September 1997 to mid-December 1997, the Thai baht fell 25% against the US dollar (USD). By how much (%) did USD appreciate against the Thai baht over this period? (d) The Thai baht (Bt) changed from Bt 29/S to Bt 33/S within the period from July 1997 to September 2017. By how much (90) did the Thai baht change over this period (to two decimal places? (e) Find the exchange rate S/ using both Bt 33.0998/S and Bt 39.5424/. (to four decimal places)