Question

At what rate a sum of money treable itself After 15 years

Answer 1

Answer:

can anyone not give question of 50 markd

Answer 2

We have,

• To figure out rate at which a certain sum of money becomes triple of itself after 15 years.

Here,

$\bf{Amount = 3 \times Principal} \: = 3P$

$\bf{Interest = Amount - Principal} \\ \bf \: \: \: \: \: \: \: \: \to \: \: \: I = \: 3P - P \: \: = 2P$

We know,

$\rm{}Rate = \frac{100 \times Interest}{Principal \times Time} \\ \\ \bf \mapsto \frac{100 \times 2P}{P \times 15} \\ \\ \bf \to \: \frac{200 \cancel{P}}{15\cancel{P}} \: = \red{13.34}$

Hence,

• At 13.34 %, a sum of money becomes triple of itself after 15 years.

♦ Important Formulae :

• $\small \tt I = \frac{ P \times R \times T }{100}$

• $\small \tt A = P + \frac{ P \times R \times T }{100}$

• $\small \tt P = \frac{ I \times 100 }{R \times T}$

• $\small \tt R = \frac{ I \times 100 }{P \times T}$

• $\small \tt T = \frac{ I \times 100 }{R \times P}$