To calculate the total number of promotional displays in 4 years, we need to apply the 9% annual increase for each year. Here's how you can calculate it:
1. Start with the current number of promotional displays: 365.
2. Apply a 9% increase for each year. Since we want to calculate for 4 years, we'll multiply the current number by (1 + 0.09) four times:
- Year 1: 365 * 1.09 = 397.85 (rounding to 398)
- Year 2: 398 * 1.09 = 434.42 (rounding to 434)
- Year 3: 434 * 1.09 = 472.06 (rounding to 472)
- Year 4: 472 * 1.09 = 514.48 (rounding to 514)
3. After 4 years, the estimated total number of promotional displays will be 514.
Therefore, if the trend continues without any changes, the total number of promotional displays in 4 years will be approximately 514.