Megan Brink is offered the possibility of investing $6,111 today at 7% interest per year in a desire to accumulate $10,500. How many years must Brink wait to accumulate $10,500? (PV of $1, FV of $1, PVA of $1, and FVA of $1) (Use appropriate factor(s) from the tables provided. Round your "PV of a single amount" to 4 decimal places and final answer to the nearest whole number.)