4 Marks Each

Question 14 Marks

Rajvi saves $₹ 50$ in the first week. Every week thereafter, she saves $1.5$ times the amount of the previous week. If her total saving is of $n$ weeks, ₹ $406.25$ find $n$.

Answer

$n=4$

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Question 24 Marks

A refrigerator is sold by a manufacturing company to a wholesaler, wholesaler to a retailor, retailor to a customer. At every stage, the price is increased by $10 \%$. If a customer pays $₹ 26,620$ as the price of a refrigerator, what is the cost price of the refrigerator for the company?

Answer

$20000$

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Question 34 Marks

Kush bought a motorcycle for $₹ 70,000$. If its cost reduces by $15 \%$ every year, what will be the value of the motorcycle at the end of the fourth year ?

Answer

₹ $36540.44$

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Question 44 Marks

The sum and the product of three consecutive terms of a $G. P.$ are $10.5$ and $8$ respectively. Find the three terms of the $G. P.$

Answer

$\frac{1}{2}, 2,8$ or $8,2, \frac{1}{2}$

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Question 54 Marks

The sum and the product of three consecutive terms of a geometric progression are $21$ and $-125$ respectively. Find the three terms of the $G. P.$

Answer

$1,-5,25$ or $25,-5,1$