$1\mathrm{.}3$ Compute the future value $F{V}_5$ of a series of $5$ payments of $R$ dollars each, paid at the end of each regular investment period into an account that earns a simple interest rate of $i\%$ per period.

$1\mathrm{.}4$ Generalize the formula for the future value $F{V}_n$ of a series of $n$ payments of $R$ dollars each, paid at the end of each investment period into an account that earns a simple interest rate of $i\%$ per period.