please show the workings

Problem 3 (9 points): The price of a risky 1C-year zero-coupon bond depends on two parameters: risk-free 10-year spot rate f(10) (to simplify notations, denote f(10) by r), and the risk factor s and it is given by P(r,s) = $1,000,000 Today r-0.05 and s=0.12, so, (1+0.5r+2rs)20 P(r,s) = $1,000,000 (1+0.5.0.05+2.0.05-0.12)20 = $483,531.61. You want to estimate the change in the bond price using first-order Taylor series approximation, i.e., write the change in price AP as a linear function of the change in interest rate Ar and risk factor As as AP=A*Ar+B*As, where A and B are some constants. a) (5 points) Find A and B. Round to the nearest integer number. b) (2 points) Using the original price function, P(r.s) = $1,000,000 (1+0.5r+2rs)20) if the risk factor increases by 0.01, by how much the interest rate should change to keep the price unchanged? c) (2 points) Using the Taylor series approximation, if the risk factor increases by 0.01, how much the interest rate should change to keep the price unchanged