Please help me about this business mathematics problem and please also answer all question. thanks

$1.$ Determine the principal that must be invested to earn $$52\mathrm{.}96$ interest in $240$ days at $7\mathrm{.}3\%.$

$2.$ If Inez is charged an interest of $$42\mathrm{.}95$ on a loan $($principal$)$ of $$950\mathrm{.}00$ for seven months, calculate the rate of interest charged on the loan.

$3.$ A debt $($present value$)$ of $$8,000$ is payable in $7$ years and $5$ months. Determine the future value of the debt at $10\mathrm{.}8\%$ compounded annually.

$4.$Determine the present value that will grow to a future value of $$1,250$ in five years at $10\%$ interest compounded quarterly.