Question

The numbers of literate persons in a village increases every year by 10%. If at present the number of literate person is 1331, then find the number of persons at 3 years ago.​

Answer 1

Step-by-step explanation:

by using compound interest formula

let principal be p

amount be 1331

rate of interest be 10%

time be 3years

A=P(1+R/100)n

1331=P(1+10/100)³

1331=P(100/100+10/100)³

1331=P(110/100)(110/100)(110/100)

1331=P(1331/1000)

1331x1000/1331=P

1000=P

hence number of persons 3 years ago is 1000