protect forest - mathematics

1.a) According to SCB statistics, 3.7% of productive forest land is now protected. If the target is about 15% and 0.1% is added each year, how many years will it take to reach the target? Round to the nearest whole number.

1.b) According to the same statistics, 2.4% of all productive forest land is harvested and thinned each year. How many years does it take before all unprotected forest is harvested or thinned? Round to the nearest whole number.

If you come to the same conclusion as I did, the correct answer is: WE NEED TO PLACE A COAL TO protect THE OLD FOREST! 🙂