$4.$ Cash Flow:

$($a$)$ Sketch and briefly explain the general trend of a typical S$-$Curve.

$($b$)$ The cash flow diagram for a small project is shown. Estimate the amount of interest charged on borrowed money using an interest rate of $1\%$ per month. Also, Estimate the highest amount of cash needed. Briefly discuss how a down payment can reduce interest charges.Cash Flow:

$($a$)$ Sketch and briefly explain the general trend of a typical S$-$Curve.

$($b$)$ The cash flow diagram for a small project is shown. Estimate the amount of interest charged on borrowed money using an interest rate of $1\%$ per month. Also, Estimate the highest amount of cash needed. Briefly discuss how a down payment can reduce interest charges.

can you please sketch the s$-$curve as requested in section $($a$)?$