Ah, but the math function is much fun here in my personal sandbox. Even though this algorithm means nothing to me anymore, let us relish in the delightful complication that this online software can produce.

${\displaystyle {\frac {\left((1+{\frac {P}{100}})^{\frac {1}{S}}\right)^{\frac {Y}{T}}-\left((1+{\frac {P}{100}})^{\frac {1}{S}}\right)^{\frac {H}{2T}}}{(1+{\frac {P}{100}})*\left(1-(1+{\frac {P}{100}})^{\frac {1}{S}}\right)}}}$

${\displaystyle \sum _{k=1}^{\infty }{\frac {9}{10^{k}}}}$