C 2 7 6 ] 
by 2 b or 83.4, gives 0.13 ; and this added to 9.5, 
and the fum multiplied by gives n.66, or 1 1 /. 
13 s. for the value in prefent payment of 100/. 
affined to a perfon 30 years of age, and payable to 
him at the death of a child feven years of age, pro- 
vided that fhould happen before his own death in 14 
years. 
It deferves to be particularly remarked, that in 
this method likewife may be determined, what lums 
ought to be paid on any furvivorfhip, within a given 
term of years, of one life beyond another, in con- 
fideration of any given fums now advanced. * 
The following example of this is a cafe which has 
offered itfelf in practice, and which I have had oc- 
cafion particularly to conffder. 
“ A perfon aged 30, having in expectation an 
“ eftate which is to come to him, provided he fur- 
“ vives a minor aged feven before he comes of 
<£ age, wants in thefe circumftances to raife 
“ 1000/. What reverfion, depending on fuch a 
“ furvivorffiiip, is a proper equivalent for this fum 
now advanced, intereft being reckoned at 3 per cent~ 
“ and the probabilities of life being fuppofed the fame 
“ with thofe in the London table of obfervations r” 
Anfwer. It appears from what has been juft de- 
termined, that, for 1 1 /. 13J. now advanced, the 
proper equivalent in thefe circumftances is 100/. to 
be paid, in cafe the fuppofed l'urvivorfhip fhould take 
place. By the rule of proportion, therefore, it will 
appear, that for 1000/. the proper equivalent is 8 576/. 
XXV. De 
