Question

At what rate %per annum wil a sum of rupees 4000 yield rupees 1324 as compound interest in 3 years

Answer 1

Given principal=4000 CI=1324 A=p+CI A=1324+4000 A=5234 A=p*(1+r/100)n 5234=4000(1+r/100)3 5324/4000=(1+r/100)3 1331/1000=(1+r/100)3 TAKING CUBE ROOT ON BOTH THE SIDES 11/10=1+r/100 11/10-1=r/100 1/10=r/100 r=100/10 therefore r=10% terefore the rate is 10%

Answer 2

Given Principal = 4000

CI =  1324

A = CI + P

A = 4000 + 1324

A = 5234

A = P X ( 1+R/$100^{3}$ )

5234 = 4000 ( 1+R/$100^{3}$ )

5234 / 4000 = ( 1+R/$100^{3}$ )

1331 / 1000 = ( 1+R/$100^{3}$ )

Now , Taking Cube Root On both the sides

11/10 = 1+ R /100

11/10 -1 =R /100

1/10 = R /100

R = 100/10

Therefore R = 10%

So , rate %per annum is 10% Ans .

Please mark it as brainiest answer ..............