Answer:
You need to save $4,012.45 each year
Step-by-step explanation:
Pertiuty in 20 years is $50,000.
So the amount must be in account after 30 years saving to enough for above pertiuty is calculated as below:
= $50000/(1+8%)+ $50000/(1+8%)^2+......+$50000/(1+8%)^20
= $50,000 * Annuity Factor ( 1-20 years) of 8%
=$50000*9.818
= $490,907
To have $490,907 (FV) in account after 30 years (tenor), now you have save an amount each year (PMT) calculated as below:
$490,907 = PMT*(1+8%)^30+....PMT*(1+8%)^2 + PMT*(1+8%)
= PMT * Discount Factor ( 1-30 years) of 8%
$490,907 = PMT * 122.346
-> PMT = $490,907/ 122.346
= $4,012.45