Question

Two college students went on spring break to Guadalajara, Mexico. One took the vacation in 2002, while the other went in 2006. Each student had $500 to spend. In 2002, the exchange rate of MXN/USD (Mexican pesos to U.S. dollars) was 9. In 2006, the exchange rate was 11. A hotel room in Guadalajara cost 200 pesos per night in 2002, and 220 pesos in 2006. If each spent five nights in a hotel, which student had more pesos left over? Exactly how many did that student have?

Answer 1

in 2002:
$1 ----> 9 pesos
$500 ----> 500*9 = 4500 pesos

hotel costs 200 pesos per night
so for 5 nights, it costs 5*200 = 1000 pesos

the first student had 4500 pesos, paid 1000 pesos for hotel, how many pesos are left ?