Question

help me please friends​

Answer 1

Answer:

(21) Ans)

Cost price of the TV (CP) = Rs. 10000

Gain percentage = 20%

Gain earned = ?

To find the gain earned, we have to find 20% of the CP.

⇒ 20% of Rs. 10000

⇒ $\frac{20}{100}$ * 10000

⇒ Rs. 2000

∴ Hence, the gain earned by him is Rs. 2000 which means the selling price is Rs. 10000 + Rs. 2000 which is Rs. 12,000

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(22) Ans)

Given principal amount (P) = Rs. 1560

Given time period (T) = 3 years

Given simple interest (SI) = Rs. 585

Rate of interest (R) = ?

We already know that simple interest is $\frac{P*R*T}{100}$ . So, by substituting the values, we will get the rate of interest.

⇒ Simple interest = $\frac{P*R*T}{100}$

⇒ Rs. 585 = $\frac{1560 * R * 3}{100}$

⇒ 585 * 100 = 1560 * R * 3

⇒ 58500 = 1560 * R * 3

⇒ $\frac{58500}{1560}$ = R * 3

⇒ 37.5 = R * 3

⇒ $\frac{37.5}{3}$ = R

⇒ 12.5% = R

∴ Hence, the rate of interest is 12.5%

Thnx and have a nice day!

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