$2\mathrm{.}6$ Mandarin Oriental. Cecilia Alvarez had always wanted to see Singapore. This was her chance. Round$-$trip airfare on Singapore Airlines $($premium economy$)$ from San Francisco where she lived was SNG$1670.$ A three$-$night stay at the Mandarin Oriental, an excellent hotel overlooking the marina $($which just so happens to have one of the best breakfasts in all of Singapore$)$ was quoted to at SNG$1050.$ If the current spot rate was SNG$1\mathrm{.}3257=$ USD$1\mathrm{.}00,$ what would just air travel and hotel cost Cecilia in U$.$S$.$ dollars?

$2\mathrm{.}7$ Peso Changes. In December $1994,$ the government of Mexico officially changed the value of the Mexican peso from $3\mathrm{.}2$ pesos per dollar to $5\mathrm{.}5$ pesos per dollar. What was the percentage change in its value? Was this a depreciation, devaluation, appreciation, or revaluation? Explain.