i need help answering question #$4$ ONLY. this is the question: $(4)$ What would happen to the values of the $7\%,10\%,$ and $13\%$ coupon bonds over time if the required return remained at $10\%?($see attached a picture of this question so that you can see what needs to be answered$)$

in case you need more info to solve, here were the preceeding questions with their corresponding answers:

$(1)$ What is the value of a $10-$year, $$1,000$ par value bond with a $10\%$ annual coupon if its required return is $10\%?$ answer: $$1000$

$(2)$ What is the value of a $13\%$ coupon bond that is otherwise identical to the bond described in $1?$ Would we now have a discount or a premium bond? answer: $$1,184\mathrm{.}34$

$(3)$ What is the value of a $7\%$ coupon bond with these characteristics? Would we now have a discount or a premium bond? answer: $$815\mathrm{.}66(4)$ What would happen to the values of the $7\%,10\%,$ and $13\%$ coupon bonds over time if the

required return remained at $10\%?$