Question

find the timewhen principal rs640,rate25/2%per annum and simple interest rs 40​

Answer 1

Answer :-

Time is 1/2 year

Solution :-

Given

Principal (P) = Rs. 640

Rate of interest (R) = 25/2 = 12.5 %

Simple interest = Rs. 40

Let the time be T years

We know that

Simple interest = PTR/100

⇒ 40 = 640 * T * 12.5/100

⇒ 40 = 64 * T * 12.5/10

⇒ 40 * 10 = 800T

⇒ 400 = 800T

⇒ 400/800 = T

⇒ T = 1/2

Therefore time is 1/2 year

Answer 2

Answer:

The Time is $\dfrac{1}{2}$ years.

Step-by-step explanation:

Gívєn -

Principal = Rs. 640

Rate of Interest = $\dfrac{25}{2}$

Simple Interest = Rs. 40

Tσ fínd -

The time

Sσlutíσn -

Here ;

• Time = ??
• Rate = $\dfrac{25}{2}$

• Simple Interest = Rs. 40
• Principal = Rs. 640

★ We know -

$\tt{SI = \dfrac{Principal \times Rate \times Time}{100}}$

$\sf{\longmapsto} \: SI = \dfrac{Principal \times Rate \times Time}{100}$

$\sf{\longmapsto} \: 40 = \dfrac{640 \times \frac{25}{2} \times T}{100}$

$\sf{\longmapsto} \: 40 \times 100 = 640 \times \frac{25}{2} \times T$

$\sf{\longmapsto} \: 4000 = 320 \times 25 \times T$

$\sf{\longmapsto} \: 4000 = 8000 T$

$\sf{\longmapsto} \: 4000 = 8000T$

$\sf{\longmapsto} \: T = \dfrac{4000}{8000}$

$\sf{\longmapsto} \: T = \dfrac{1}{2}$

$\therefore$ The Time is $\dfrac{1}{2}$ years.