How can part a b and c be solved? I wrote down the general formulas to solve them, but Im having trouble finding the correct values.

tof.fin years..ago. Tha bond-with-call price,of two were-saldata new bands af teir faie valvs of &i,ooo per bond. Tre flotaiien casts of arq inal tax t is toz and the new bonds are Sold 4 months before the alel bands are called. ash autflow t the refundline opera hon ll Prem Flatation Cout of new bords vecla Ovela d diucount Tar rale at ID