How much less would a 25 year old male pay for a $50,000 policy of 20 y life insurance @ $5.84 per $1000, than a straight life policy @ $15.66 per $1000?

This can be solved using the formula

F = P (1+i) ^n

Where F is the future worth

P is the principal amount

i is the interest rate

n is the number of years

at 5.84 per 1000 = 0.00584

F = 50000 (1+0.00584) ^20

F = 5617.56

At 15.66 per 1000 = 0.01566

F = 50000 (1+0.01566) ^20

F = 6822.40

So he will pay less = 6822.40 - 5617.56 = $1237.84