In 1972, the maximum earnings of a worker subject to Social Security tax (SST) was $9,000. The maximum earnings subject to SST in 2017 is $127,200. What compound annual increase has been experienced...

In 1972, the maximum earnings of a worker subject to Social Security tax (SST) was $9,000. The maximum earnings subject to SST in 2017 is $127,200. What compound annual increase has been experienced over this 45-year period of time? How does it compare with a 3% annual increase in the consumer price index over this same period of time?