Explanation:
Time (in years) = (733,500 baht - 450,000 baht) / (450,000 baht * 9%)
Plugging in the values, we get:
Time (in years) = (733,500 baht - 450,000 baht) / (450,000 baht * 0.09)
Time (in years) = (283,500 baht) / (40,500 baht)
Time (in years) = 7 years