Question

M.C.Q: The price of 10 pens is RS ^48 1/2, then the price of such 100 pens is
(a)Rs 485
(b)Rs 4850
(c)Rs 4820
(d)Rs 480.2​

Answer 1

Given:-

๛Cost of 10Pens=₹48.5

$\rule{200}{1}$

To Find:-

✪The Cost of 100 pens?

$\rule{200}{1}$

AnsWer:-

☞Option A)₹485

$\rule{200}{1}$

♦Let us find the cost of 1 Pen♦

↝10Pens=₹48.5

↝1Pen=$\frac{\cancel{48.5}}{\cancel{10}}$

↝1Pen=₹4.85

★Now cost of 100 Pens★

↝100Pen=₹4.85×100

↝100Pen=₹485

$\rule{200}{2}$

Answer 2

Given ;

Price of 10 pens = 48 1/2

Solution ;

$price \: \: of \: \: 10 \: \: pens \: \: = 48 \times \frac{1}{2} = \frac{ 48 \times 2 + 1 }{2}= \frac{97}{2}$

$price \: \: of \: \: 1 \: \: pen = \frac{ \frac{97}{2} }{10} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{97}{2} \times \frac{1}{10} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{97}{20}$

Therefore ,,,

$price \: \: of \: \: 100 \: \: pens \: \: = \frac{97}{20} \times 100 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 485$

Therefore ,,,, Option ( a ) 485 is the correct answer ....

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