On Feb $1,$ Beth invests $$2,517\mathrm{.}30$ in a company. The interest rate was $1\mathrm{.}15\%$ per year. Later, she received a notification that her interest rate increases to $3\mathrm{.}50\%$ that is valid from Feb $1.$Her interest rate is not updated on the system until Feb $21.$

She received the yield iao $$5\mathrm{.}07,$ which is Feb $1-$ Feb $21$ at $1\mathrm{.}15\%$

and Feb $22-$ Feb $29$ at $3\mathrm{.}50\%$Calculate the remain that she is going to receive for Feb $1$ to the end of Feb $21(21$ days$).$Show your calculations.