Problem 5 please

Problem \#4: What is the price P today of a $80,000 182-day Canadian T-Bill if its quoted yield is 9.55% ? Problem \#4: Answer correct to 2 decimals. Problem \#5: Find didP, the derivative of the previous result from Problem #4 above, with respect to the quoted yield i. Use this derivative to approximate the change in the price of the T-Bill if the yield were to have decreased by 0.002 (i.e. 0.2% ) immediately after the T-Bill was purchased. Problem \#5: Answer correct to 2 decimals