I would really appreciate if someone with a financial calculator coould help me solve for r to work out an interest rate in the first question and a yield in the second.
The first equation is = 99951.33=400[1/r-( 1/(r(1+r)^144))] x (1+r)144
The second equation is = 1000= 40/((1+r)) + 40/((1+r)^2) + 40/((1+r)^3)… (40+ 1296.529)/((1+r)^10)
Thanks a lot!