Question

In what time will $400 amount to $512 if the simple interest is the calculated at 14% p.a.?

Answer 1

si = amount - principle

si = 512-400 = $112

p = $400

r = 14%

therefore

time = (100×si)/(p×r)

=100×112/400×14

2 years

Answer 2

ANSWER : 2 years...

Final Amount(A) = $512

Princiapl(P) = $400

Rate of Interest(R) = 14% p.a

FORMULAS  USED:

SI = P×R×T/100

A = P + SI

⇒$512 = $ 400 + SI

⇒SI = $512 - 400$

      = $112

∴112 = 400×14×T/100

⇒112 = 4×14×T

⇒T = 112/56

⇒T = 2 years...

I HOPE IT HELPS...!!!