PV_A = 22487 ## one cycle present values
PV_B = 37582
PVs = c(PV_A, PV_B)
ns = c(4, 6)

r = 0.1

numer = r * (1 + r)^ns * PVs
denom = (1 + r)^ns - 1
print( numer/denom )