31.24 ≤ n
1.301 over 0.033 1.301 0.033 ≤ n
20 ≤ (1 + .08)n
log 20 ≤ nlog(1.08)
log 20 over log 1.08 log 20 log 1.08 ≤ n
log 20 ≤ log (1 + .08)n
10,000 ≤ 500(1 + .08)n
?