policy age lx px qx 100000 105 583 0.66309 0.33691 5 100000 106 584 1.66309 1.33691 7 100000 107 585 2.66309 2.33691 1 100000 108 586 3.66309 3.33691 73 100000 109 587 4.66309 4.33691 57 52 20 mortality rate what is premium paid in 5 years equal installments PVIF