Question $1$ For a $5-$year simple loan of $$20,000$ at $6$ percent, the amount to be repaid is$?$

question $2$ If a security pays $$155$ next year and $$185$ the year after that, what is its yield to maturity if it sells for $$300?$

question $3$ For a $4-$year simple loan of $$10,000$ at $10$ percent, the amount to be repaid is $?$

question $4$ A three$-$year bond with a $$1,000$ face value and $8\%$ coupon rate is sold for $$1,000$ today. If one year later, the market interest rate changes to $7\%.$ If you sell that bond after one year, what is your rate of return?