I NEED EXCEL FUNCTION AND ANSWER OF ONLY PART E$,$F$,$G

Question $3.$ A bond with a face value of $$1000$ and a maturity of exactly $20$ years pays an annual coupon of $10\%.$ This bond is currently selling at an annual yield$-$to$-$maturity $($YTM$)$ of $12\%.$ Answer the following questions for this bond.

Calculate the current price of the bond by discounting all the cash flows of the bond using the timeline method. $(10)$

Calculate the modified duration of the bond without using any Excel built$-$in function. $(10)$

Using modified Duration, calculate what would be the new price of the bond when YTM is $11\%.(6)$

Using modified Duration, what is the percentage change in price from the original level $($found in part a$)$ when YTM is $11\%?(6)$

Calculate the convexity of the bond without using any Excel built$-$in function. $(12)$

Using the modified duration plus convexity model, what is the new price of the bond when YTM is $13\%?(6)$

Using the modified duration plus convexity model, what is the percentage price change from the original level $($found in part a$)$ of the bond when YTM is $13\%.(6)$