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# The cost of one pencil is Rs. 1.50, then the cost of 10 pencils is-A. Rs 15B. Rs. 150C. Rs. 1.5D. None of these

Last updated date: 26th Mar 2023
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Hint: For this type of question unitary method is required and we must also know the multiplication involving decimal.Cost of one pencil is given, we have to find the cost of 10 pencils ,So multiply cost of one pencil with number of pencils to get the required answer.

Unitary method says that if the cost of x item is Rs. y then cost of 1 item is $\dfrac{y}{x}$ …(i) . Now if we wish to calculate cost of z items then it will be $z\times \dfrac{x}{y}$ …(ii)
Therefore, our $\dfrac{x}{y}=Rs.\,1.50$ and z is equal to 10
$\dfrac{x}{y}\times z=1.50\times 10$
Therefore, $1.50\times 10=15.0$
In this multiplication we can see that when we do $150\times 10$ , we get 1500 and then we put decimal before the last two digits because in 1.50 we have two digits after decimal.