1.

In what time sum of money will triple itself at 20 per annum

Answer»

let the sum of money be 100.

then amount=3*100=300

rate of interest= 20% p.a.

let the time be x yrs

si = a-p =$300-$100=$200

si= (p*r*t)/100

200=(100*20*x)/100

200=20x

x=200/20

x=10

ans- it will TRIPLE in 10 yrs


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