$1.$ What$$s the present value of a series of $20$ payments of USD $2,000$ each paid at the end of each year starting at the end of the first year and a single payment of USD $30,000$ which is to be paid $10$ years from now if we assume that the discount rate does not change over time and is equal to $4\%$

$2.$ How much is a promise of receiving perpetually a sum of USD $1,000$ each month worth now if the stated annual interest rate is $6\%?$

$3.$ A company$$s $2023$ sales were $$100$ million. If sales grow at $8\%$ per year, how large will they be $10$ years later, in $2033,$ in millions?

$4.$ At a rate of $8\%,$ what is the present value of the following cash flow stream? $$0$ at Time $0$; $$100$ at the end of Year $1$; $$300$ at the end of Year $2$; $$0$ at the end of Year $3$; and $$500$ at the end of Year $4?$