Answer:
5
Explanation:
total cost of hotel stay = cost per night + tax + parking charge + tips
tax = 10% x 90
= 0.1 x 90 = 9
let x = number of stays
90x + 9x + 12 + 30 ≤ 600
combine like terms
99x ≤ 558
x ≤ 5.6
if they stay 5 nights, they would spend 537
if they stay 6 nights, they would spend 636