Ken is making monthly contributions of of $$400$ to his savings account which pays interest at the rate of $5\mathrm{.}5\%,$ compounded monthly.

Right after Ken makes his $70$ th contribution, the bank changes his rate to $4\mathrm{.}7\%.$ Ken makes $60$ more $$400$ contributions.

What is Ken's balance right after his last contribution?

Use the TVM Solver to answer the question. Round to the nearest cent $($two decimal places.$)$