Logarithmic Word Problems

The population in the town of Huntersville is presently 38,300.  The town grows at an annual rate of 1.2%.  Find the number of years it takes for the population to grow to 42,500.

The population in the town of Deersburgh is presently 42,500.  The town has been growing at a steady rate of 2.7%.  Find the number of years ago that the population was 30,000.

$1,200 is invested at an annual rate of 3.2$1,480.

The value of a stock when purchased was $10 a share.  The stock grew at a monthly rate of 7$15.75 a share.

The value of a stock when purchased is $10 a share.  The stock decreased at a rate of 3$7.40.