part = percent x total

$\text{discount}=\text{percent discount}\times \text{original price}$

$\text{sale price}=\text{original price}-\text{discount}$

$\text{sale price}=\text{original price}-\text{percent discount}\times \text{original price}=\text{original price}\times \text{(1}-\text{percent discount)}$

$\text{markup}=\text{percent markup}\times \text{cost}$

$\text{retail price}=\text{cost}+\text{markup}$

$\text{retail price}=\text{cost}+\text{percent markup}\times \text{cost}=\text{cost}\times \text{(1}+\text{percent markup)}$

$\text{sales tax}=\text{purchase price}\times \text{tax rate}$

$\text{Total price}=\text{purchase price}+\text{purchase price}\times \text{tax rate}=\text{purchase price}\times \text{(1}+\text{tax rate)}$

$I=P\times r\times t$

$T=P+I$

$T=P+P\times r\times t$

$I=P\times \frac{r}{365}\times t$

$FV=P+I=P+P\times r\times t$

$A=P\times \frac{r\times {(1+r)}^t}{{(1+r)}^t-1}$

$PV=\frac{FV}{(1+rt)}$

$A=P{\left(1+\frac{r}{n}\right)}^{nt}$

$PV=\frac{A}{{\left(1+\frac{r}{n}\right)}^{n\times t}}$

$Y={\left(1+\frac{r}{n}\right)}^n-1$

$A=P{\left(1+\frac{r}{n}\right)}^{nt}$

$\text{ROI}=\frac{FV-P}{P}$

$FV=pmt\times \frac{{(1+r/n)}^{n\times t}-1}{r/n}$

$pmt=\frac{FV\times (r/n)}{{(1+r/n)}^{n\times t}-1}$

$\text{annual return}={\left(\frac{FV}{P}\right)}^{\left(\frac{1}{t}\right)}-1$

$\text{P}/\text{E}=\frac{\text{Share Price}}{\text{Dividend}}$

$\text{Yld}\text{\%}=\frac{\text{Annual Dividend}}{\text{Share Price}}\times 100\text{\%}$

$I=P\times \frac{r}{n}$

$pmt=\frac{P\times (r/n)\times {(1+r/n)}^{n\times t}}{{(1+r/n)}^{n\times t}-1}$

$\text{funding gap}=\text{total cost}-\text{all aid}$

$A=P{\left(1+\frac{r}{n}\right)}^{nt}$

$pmt=\frac{P\times (r/n)\times {(1+r/n)}^{n\times t}}{{(1+r/n)}^{n\times t}-1}$

$\text{discretionary income}=\text{gross income}-1.5\times \text{poverty guideline}$

$I=\frac{\text{ADB}\times r\times d}{365}$

$pmt=\frac{P\times (r/n)\times {(1+r/n)}^{n\times t}}{{(1+r/n)}^{n\times t}-1}$

$\text{MD}=\frac{P-R}{n}$

$\text{APR}=2400\times \text{MF}$

$\text{MF}=\text{APR}/\mathrm{2,400}$

$PMT=\frac{(P-R)}{n}+(P+R)\times \text{MF}$

$pmt=\frac{P\times (r/12)\times {(1+r/12)}^{12\times t}}{{(1+r/12)}^{12\times t}-1}$

$T=pmt\times 12\times t$

$\text{CoF}=T-P$