Question

Find the rate of intrest by which a sum can triple itself in 16 years

Answer 1

r=12.5%

principle is x 
amount is 3x 
SI is 3x-x=2x
time 16year
SI=prt/ 100
2x=x*r*16/100
r=(2x*100)/(16*x)
r=12.5%
Hope it helps! ^^