$800 is due at the end of 4 years and $700 at the end of 8 years. If money is worth j_12 = 3%, determine an equivalent single amount at

(a) the end of 2 years;

(b) at the end of 6 years;

(c) the end of 10 years.

notej_m is the nominal rate of interest compounding m times per year.