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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

And this method is also majorly used for ratio and proportion constant .