Question

# A pharmaceutical manufacturer bought 0.25 quintal of hirada , a medical plant , at 9500 rupees . What is the cost per quintal of hirada ? ( 1 quintal = 100 kg )

Hint: Here we have to apply unitary method and unitary method is a technique for solving a problem by first finding the value of a single unit or quantity and then finding necessary value by multiplying the single unit or quantity value .

Complete-step-by-step solution
Given that the manufacturer bought 0.25 quintal hirada ( a medical plant ) and
We know that ,
1 quintal = 100 kg
Therefore ,
0.25 quintal =( $0.25 \times 100$ ) kg
= 25 kg
Now ,
Cost of 0.25 quintal hirada = Rs 9500
Or we can write it as
Cost of 25 kg hirada = Rs 9500
So cost if 1 kg of hirada = $\dfrac{{9500}}{{25}} = Rs 380$
Cost of 1 quintal i.e. 100 kg hirada = 100 $\times$ cost of 1 kg of hirada
= Rs ($380 \times 100$)
= Rs 38000

Hence , the cost of 1 quintal hirada is Rs 38000.

Note:In this type of questions first we have to find the amount for one quantity ( 1 kg ) and then multiply by the desired amount .
And this method is also majorly used for ratio and proportion constant .